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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A hash table where the iteration order of the key-value pairs is independent of the hash values of the keys."><title>IndexMap in indexmap::map - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-492a78a4a87dcc01.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="indexmap" data-themes="" data-resource-suffix="" data-rustdoc-version="1.82.0 (f6e511eec 2024-10-15)" data-channel="1.82.0" data-search-js="search-a99f1315e7cc5121.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-921df33f47b8780c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-3b12f09e550e0385.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../indexmap/index.html">indexmap</a><span class="version">1.9.3</span></h2></div><h2 class="location"><a href="#">Index<wbr>Map</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.capacity">capacity</a></li><li><a href="#method.clear">clear</a></li><li><a href="#method.contains_key">contains_key</a></li><li><a href="#method.drain">drain</a></li><li><a href="#method.entry">entry</a></li><li><a href="#method.first">first</a></li><li><a href="#method.first_mut">first_mut</a></li><li><a href="#method.get">get</a></li><li><a href="#method.get_full">get_full</a></li><li><a href="#method.get_full_mut">get_full_mut</a></li><li><a href="#method.get_index">get_index</a></li><li><a href="#method.get_index_mut">get_index_mut</a></li><li><a href="#method.get_index_of">get_index_of</a></li><li><a href="#method.get_key_value">get_key_value</a></li><li><a href="#method.get_mut">get_mut</a></li><li><a href="#method.hasher">hasher</a></li><li><a href="#method.insert">insert</a></li><li><a href="#method.insert_full">insert_full</a></li><li><a href="#method.into_keys">into_keys</a></li><li><a href="#method.into_values">into_values</a></li><li><a href="#method.is_empty">is_empty</a></li><li><a href="#method.iter">iter</a></li><li><a href="#method.iter_mut">iter_mut</a></li><li><a href="#method.keys">keys</a></li><li><a href="#method.last">last</a></li><li><a href="#method.last_mut">last_mut</a></li><li><a href="#method.len">len</a></li><li><a href="#method.move_index">move_index</a></li><li><a href="#method.new">new</a></li><li><a href="#method.pop">pop</a></li><li><a href="#method.remove">remove</a></li><li><a href="#method.remove_entry">remove_entry</a></li><li><a href="#method.reserve">reserve</a></li><li><a href="#method.retain">retain</a></li><li><a href="#method.reverse">reverse</a></li><li><a href="#method.shift_remove">shift_remove</a></li><li><a href="#method.shift_remove
of the hash values of the keys.</p>
<p>The interface is closely compatible with the standard <code>HashMap</code>, but also
has additional features.</p>
<h2 id="order"><a class="doc-anchor" href="#order">§</a>Order</h2>
<p>The key-value pairs have a consistent order that is determined by
the sequence of insertion and removal calls on the map. The order does
not depend on the keys or the hash function at all.</p>
<p>All iterators traverse the map in <em>the order</em>.</p>
<p>The insertion order is preserved, with <strong>notable exceptions</strong> like the
<code>.remove()</code> or <code>.swap_remove()</code> methods. Methods such as <code>.sort_by()</code> of
course result in a new order, depending on the sorting order.</p>
<h2 id="indices"><a class="doc-anchor" href="#indices">§</a>Indices</h2>
<p>The key-value pairs are indexed in a compact range without holes in the
range <code>0..self.len()</code>. For example, the method <code>.get_full</code> looks up the
index for a key, and the method <code>.get_index</code> looks up the key-value pair by
index.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="comment">// count the frequency of each letter in a sentence.
</span><span class="kw">let </span><span class="kw-2">mut </span>letters = IndexMap::new();
<span class="kw">for </span>ch <span class="kw">in </span><span class="string">"a short treatise on fungi"</span>.chars() {
<span class="kw-2">*</span>letters.entry(ch).or_insert(<span class="number">0</span>) += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(letters[<span class="kw-2">&amp;</span><span class="string">'s'</span>], <span class="number">2</span>);
<span class="macro">assert_eq!</span>(letters[<span class="kw-2">&amp;</span><span class="string">'t'</span>], <span class="number">3</span>);
<span class="macro">assert_eq!</span>(letters[<span class="kw-2">&amp;</span><span class="string">'u'</span>], <span class="number">1</span>);
<span class="macro">assert_eq!</span>(letters.get(<span class="kw-2">&amp;</span><span class="string">'y'</span>), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-IndexMap%3CK,+V%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#144-159">source</a><a href="#impl-IndexMap%3CK,+V%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V&gt; <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#147-149">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>() -&gt; Self</h4></section></summary><div class="docblock"><p>Create a new map. (Does not allocate.)</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_capacity" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#156-158">source</a><h4 class="code-header">pub fn <a href="#method.with_capacity" class="fn">with_capacity</a>(n: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>) -&gt; Self</h4></section></summary><div class="docblock"><p>Create a new map with capacity for <code>n</code> key-value pairs. (Does not
allocate if <code>n</code> is zero.)</p>
<p>Computes in <strong>O(n)</strong> time.</p>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#161-317">source</a><a href="#impl-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_capacity_and_hasher" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#167-176">source</a><h4 class="code-header">pub fn <a href="#method.with_capacity_and_hasher" class="fn">with_capacity_and_hasher</a>(n: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, hash_builder: S) -&gt; Self</h4></section></summary><div class="docblock"><p>Create a new map with capacity for <code>n</code> key-value pairs. (Does not
allocate if <code>n</code> is zero.)</p>
<p>Computes in <strong>O(n)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_hasher" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#182-187">source</a><h4 class="code-header">pub const fn <a href="#method.with_hasher" class="fn">with_hasher</a>(hash_builder: S) -&gt; Self</h4></section></summary><div class="docblock"><p>Create a new map with <code>hash_builder</code>.</p>
<p>This function is <code>const</code>, so it
can be called in <code>static</code> contexts.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.capacity" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#190-192">source</a><h4 class="code-header">pub fn <a href="#method.capacity" class="fn">capacity</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.hasher" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#195-197">source</a><h4 class="code-header">pub fn <a href="#method.hasher" class="fn">hasher</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;S</a></h4></section></summary><div class="docblock"><p>Return a reference to the map’s <code>BuildHasher</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.len" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#203-205">source</a><h4 class="code-header">pub fn <a href="#method.len" class="fn">len</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Return the number of key-value pairs in the map.</p>
<p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_empty" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#211-213">source</a><h4 class="code-header">pub fn <a href="#method.is_empty" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns true if the map contains no elements.</p>
<p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.iter" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#216-220">source</a><h4 class="code-header">pub fn <a href="#method.iter" class="fn">iter</a>(&amp;self) -&gt; <a class="struct" href="struct.Iter.html" title="struct indexmap::map::Iter">Iter</a>&lt;'_, K, V&gt; <a href="#" class="tooltip" data-notable-ty="Iter&lt;&#39;_, K, V&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an iterator over the key-value pairs of the map, in their order</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.iter_mut" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#223-227">source</a><h4 class="code-header">pub fn <a href="#method.iter_mut" class="fn">iter_mut</a>(&amp;mut self) -&gt; <a class="struct" href="struct.IterMut.html" title="struct indexmap::map::IterMut">IterMut</a>&lt;'_, K, V&gt; <a href="#" class="tooltip" data-notable-ty="IterMut&lt;&#39;_, K, V&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an iterator over the key-value pairs of the map, in their order</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.keys" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#230-234">source</a><h4 class="code-header">pub fn <a href="#method.keys" class="fn">keys</a>(&amp;self) -&gt; <a class="struct" href="struct.Keys.html" title="struct indexmap::map::Keys">Keys</a>&lt;'_, K, V&gt; <a href="#" class="tooltip" data-notable-ty="Keys&lt;&#39;_, K, V&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an iterator over the keys of the map, in their order</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.into_keys" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#237-241">source</a><h4 class="code-header">pub fn <a href="#method.into_keys" class="fn">into_keys</a>(self) -&gt; <a class="struct" href="struct.IntoKeys.html" title="struct indexmap::map::IntoKeys">IntoKeys</a>&lt;K, V&gt; <a href="#" class="tooltip" data-notable-ty="IntoKeys&lt;K, V&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an owning iterator over the keys of the map, in their order</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.values" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#244-248">source</a><h4 class="code-header">pub fn <a href="#method.values" class="fn">values</a>(&amp;self) -&gt; <a class="struct" href="struct.Values.html" title="struct indexmap::map::Values">Values</a>&lt;'_, K, V&gt; <a href="#" class="tooltip" data-notable-ty="Values&lt;&#39;_, K, V&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an iterator over the values of the map, in their order</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.values_mut" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#252-256">source</a><h4 class="code-header">pub fn <a href="#method.values_mut" class="fn">values_mut</a>(&amp;mut self) -&gt; <a class="struct" href="struct.ValuesMut.html" title="struct indexmap::map::ValuesMut">ValuesMut</a>&lt;'_, K, V&gt; <a href="#" class="tooltip" data-notable-ty="ValuesMut&lt;&#39;_, K, V&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an iterator over mutable references to the values of the map,
in their order</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.into_values" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#259-263">source</a><h4 class="code-header">pub fn <a href="#method.into_values" class="fn">into_values</a>(self) -&gt; <a class="struct" href="struct.IntoValues.html" title="struct indexmap::map::IntoValues">IntoValues</a>&lt;K, V&gt; <a href="#" class="tooltip" data-notable-ty="IntoValues&lt;K, V&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Return an owning iterator over the values of the map, in their order</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.clear" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#268-270">source</a><h4 class="code-header">pub fn <a href="#method.clear" class="fn">clear</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Remove all key-value pairs in the map, while preserving its capacity.</p>
<p>Computes in <strong>O(n)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.truncate" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#275-277">source</a><h4 class="code-header">pub fn <a href="#method.truncate" class="fn">truncate</a>(&amp;mut self, len: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Shortens the map, keeping the first <code>len</code> elements and dropping the rest.</p>
<p>If <code>len</code> is greater than the map’s current length, this has no effect.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.drain" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#292-299">source</a><h4 class="code-header">pub fn <a href="#method.drain" class="fn">drain</a>&lt;R&gt;(&amp;mut self, range: R) -&gt; <a class="struct" href="struct.Drain.html" title="struct indexmap::map::Drain">Drain</a>&lt;'_, K, V&gt; <a href="#" class="tooltip" data-notable-ty="Drain&lt;&#39;_, K, V&gt;">ⓘ</a><div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/range/trait.RangeBounds.html" title="trait core::ops::range::RangeBounds">RangeBounds</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>&gt;,</div></h4></section></summary><div class="docblock"><p>Clears the <code>IndexMap</code> in the given index range, returning those
key-value pairs as a drain iterator.</p>
<p>The range may be any type that implements <code>RangeBounds&lt;usize&gt;</code>,
including all of the <code>std::ops::Range*</code> types, or even a tuple pair of
<code>Bound</code> start and end values. To drain the map entirely, use <code>RangeFull</code>
like <code>map.drain(..)</code>.</p>
<p>This shifts down all entries following the drained range to fill the
gap, and keeps the allocated memory for reuse.</p>
<p><em><strong>Panics</strong></em> if the starting point is greater than the end point or if
the end point is greater than the length of the map.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_off" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#308-316">source</a><h4 class="code-header">pub fn <a href="#method.split_off" class="fn">split_off</a>(&amp;mut self, at: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>) -&gt; Self<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h4></section></summary><div class="docblock"><p>Splits the collection into two at the given index.</p>
<p>Returns a newly allocated map containing the elements in the range
<code>[at, len)</code>. After the call, the original map will be left containing
the elements <code>[0, at)</code> with its previous capacity unchanged.</p>
<p><em><strong>Panics</strong></em> if <code>at &gt; len</code>.</p>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IndexMap%3CK,+V,+S%3E-1" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#319-773">source</a><a href="#impl-IndexMap%3CK,+V,+S%3E-1" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.reserve" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#327-329">source</a><h4 class="code-header">pub fn <a href="#method.reserve" class="fn">reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Reserve capacity for <code>additional</code> more key-value pairs.</p>
<p>Computes in <strong>O(n)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.shrink_to_fit" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#334-336">source</a><h4 class="code-header">pub fn <a href="#method.shrink_to_fit" class="fn">shrink_to_fit</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Shrink the capacity of the map as much as possible.</p>
<p>Computes in <strong>O(n)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.shrink_to" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#341-343">source</a><h4 class="code-header">pub fn <a href="#method.shrink_to" class="fn">shrink_to</a>(&amp;mut self, min_capacity: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Shrink the capacity of the map with a lower limit.</p>
<p>Computes in <strong>O(n)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.insert" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#364-366">source</a><h4 class="code-header">pub fn <a href="#method.insert" class="fn">insert</a>(&amp;mut self, key: K, value: V) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;V&gt;</h4></section></summary><div class="docblock"><p>Insert a key-value pair in the map.</p>
<p>If an equivalent key already exists in the map: the key remains and
retains in its place in the order, its corresponding value is updated
with <code>value</code> and the older value is returned inside <code>Some(_)</code>.</p>
<p>If no equivalent key existed in the map: the new key-value pair is
inserted, last in order, and <code>None</code> is returned.</p>
<p>Computes in <strong>O(1)</strong> time (amortized average).</p>
<p>See also <a href="#method.entry"><code>entry</code></a> if you you want to insert <em>or</em> modify
or if you need to get the index of the corresponding key-value pair.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.insert_full" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#381-384">source</a><h4 class="code-header">pub fn <a href="#method.insert_full" class="fn">insert_full</a>(&amp;mut self, key: K, value: V) -&gt; (<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;V&gt;)</h4></section></summary><div class="docblock"><p>Insert a key-value pair in the map, and get their index.</p>
<p>If an equivalent key already exists in the map: the key remains and
retains in its place in the order, its corresponding value is updated
with <code>value</code> and the older value is returned inside <code>(index, Some(_))</code>.</p>
<p>If no equivalent key existed in the map: the new key-value pair is
inserted, last in order, and <code>(index, None)</code> is returned.</p>
<p>Computes in <strong>O(1)</strong> time (amortized average).</p>
<p>See also <a href="#method.entry"><code>entry</code></a> if you you want to insert <em>or</em> modify
or if you need to get the index of the corresponding key-value pair.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.entry" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#390-393">source</a><h4 class="code-header">pub fn <a href="#method.entry" class="fn">entry</a>(&amp;mut self, key: K) -&gt; <a class="enum" href="enum.Entry.html" title="enum indexmap::map::Entry">Entry</a>&lt;'_, K, V&gt;</h4></section></summary><div class="docblock"><p>Get the given key’s corresponding entry in the map for insertion and/or
in-place manipulation.</p>
<p>Computes in <strong>O(1)</strong> time (amortized average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.contains_key" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#398-403">source</a><h4 class="code-header">pub fn <a href="#method.contains_key" class="fn">contains_key</a>&lt;Q&gt;(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.bool.html">bool</a><div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Return <code>true</code> if an equivalent to <code>key</code> exists in the map.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#409-419">source</a><h4 class="code-header">pub fn <a href="#method.get" class="fn">get</a>&lt;Q&gt;(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Return a reference to the value stored for <code>key</code>, if it is present,
else <code>None</code>.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_key_value" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#425-435">source</a><h4 class="code-header">pub fn <a href="#method.get_key_value" class="fn">get_key_value</a>&lt;Q&gt;(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>)&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Return references to the key-value pair stored for <code>key</code>,
if it is present, else <code>None</code>.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_full" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#438-448">source</a><h4 class="code-header">pub fn <a href="#method.get_full" class="fn">get_full</a>&lt;Q&gt;(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>)&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Return item index, key and value</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_index_of" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#453-463">source</a><h4 class="code-header">pub fn <a href="#method.get_index_of" class="fn">get_index_of</a>&lt;Q&gt;(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Return item index, if it exists in the map</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><section id="method.get_mut" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#465-475">source</a><h4 class="code-header">pub fn <a href="#method.get_mut" class="fn">get_mut</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a>&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section><section id="method.get_full_mut" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#477-487">source</a><h4 class="code-header">pub fn <a href="#method.get_full_mut" class="fn">get_full_mut</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a>)&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section><details class="toggle method-toggle" open><summary><section id="method.remove" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#512-517">source</a><h4 class="code-header">pub fn <a href="#method.remove" class="fn">remove</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;V&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Remove the key-value pair equivalent to <code>key</code> and return
its value.</p>
<p><strong>NOTE:</strong> This is equivalent to <code>.swap_remove(key)</code>, if you need to
preserve the order of the keys in the map, use <code>.shift_remove(key)</code>
instead.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.remove_entry" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#526-531">source</a><h4 class="code-header">pub fn <a href="#method.remove_entry" class="fn">remove_entry</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Remove and return the key-value pair equivalent to <code>key</code>.</p>
<p><strong>NOTE:</strong> This is equivalent to <code>.swap_remove_entry(key)</code>, if you need to
preserve the order of the keys in the map, use <code>.shift_remove_entry(key)</code>
instead.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap_remove" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#543-548">source</a><h4 class="code-header">pub fn <a href="#method.swap_remove" class="fn">swap_remove</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;V&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Remove the key-value pair equivalent to <code>key</code> and return
its value.</p>
<p>Like <code>Vec::swap_remove</code>, the pair is removed by swapping it with the
last element of the map and popping it off. <strong>This perturbs
the position of what used to be the last element!</strong></p>
<p>Return <code>None</code> if <code>key</code> is not in map.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap_remove_entry" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#559-567">source</a><h4 class="code-header">pub fn <a href="#method.swap_remove_entry" class="fn">swap_remove_entry</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Remove and return the key-value pair equivalent to <code>key</code>.</p>
<p>Like <code>Vec::swap_remove</code>, the pair is removed by swapping it with the
last element of the map and popping it off. <strong>This perturbs
the position of what used to be the last element!</strong></p>
<p>Return <code>None</code> if <code>key</code> is not in map.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap_remove_full" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#579-588">source</a><h4 class="code-header">pub fn <a href="#method.swap_remove_full" class="fn">swap_remove_full</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, K, V)&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Remove the key-value pair equivalent to <code>key</code> and return it and
the index it had.</p>
<p>Like <code>Vec::swap_remove</code>, the pair is removed by swapping it with the
last element of the map and popping it off. <strong>This perturbs
the position of what used to be the last element!</strong></p>
<p>Return <code>None</code> if <code>key</code> is not in map.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.shift_remove" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#600-605">source</a><h4 class="code-header">pub fn <a href="#method.shift_remove" class="fn">shift_remove</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;V&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Remove the key-value pair equivalent to <code>key</code> and return
its value.</p>
<p>Like <code>Vec::remove</code>, the pair is removed by shifting all of the
elements that follow it, preserving their relative order.
<strong>This perturbs the index of all of those elements!</strong></p>
<p>Return <code>None</code> if <code>key</code> is not in map.</p>
<p>Computes in <strong>O(n)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.shift_remove_entry" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#616-624">source</a><h4 class="code-header">pub fn <a href="#method.shift_remove_entry" class="fn">shift_remove_entry</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Remove and return the key-value pair equivalent to <code>key</code>.</p>
<p>Like <code>Vec::remove</code>, the pair is removed by shifting all of the
elements that follow it, preserving their relative order.
<strong>This perturbs the index of all of those elements!</strong></p>
<p>Return <code>None</code> if <code>key</code> is not in map.</p>
<p>Computes in <strong>O(n)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.shift_remove_full" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#636-645">source</a><h4 class="code-header">pub fn <a href="#method.shift_remove_full" class="fn">shift_remove_full</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, K, V)&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Remove the key-value pair equivalent to <code>key</code> and return it and
the index it had.</p>
<p>Like <code>Vec::remove</code>, the pair is removed by shifting all of the
elements that follow it, preserving their relative order.
<strong>This perturbs the index of all of those elements!</strong></p>
<p>Return <code>None</code> if <code>key</code> is not in map.</p>
<p>Computes in <strong>O(n)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.pop" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#652-654">source</a><h4 class="code-header">pub fn <a href="#method.pop" class="fn">pop</a>(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt;</h4></section></summary><div class="docblock"><p>Remove the last key-value pair</p>
<p>This preserves the order of the remaining elements.</p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.retain" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#663-668">source</a><h4 class="code-header">pub fn <a href="#method.retain" class="fn">retain</a>&lt;F&gt;(&amp;mut self, keep: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Scan through each key-value pair in the map and keep those where the
closure <code>keep</code> returns <code>true</code>.</p>
<p>The elements are visited in order, and remaining elements keep their
order.</p>
<p>Computes in <strong>O(n)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_keys" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#680-687">source</a><h4 class="code-header">pub fn <a href="#method.sort_keys" class="fn">sort_keys</a>(&amp;mut self)<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section></summary><div class="docblock"><p>Sort the map’s key-value pairs by the default ordering of the keys.</p>
<p>See <a href="struct.IndexMap.html#method.sort_by" title="method indexmap::map::IndexMap::sort_by"><code>sort_by</code></a> for details.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_by" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#697-704">source</a><h4 class="code-header">pub fn <a href="#method.sort_by" class="fn">sort_by</a>&lt;F&gt;(&amp;mut self, cmp: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>,</div></h4></section></summary><div class="docblock"><p>Sort the map’s key-value pairs in place using the comparison
function <code>cmp</code>.</p>
<p>The comparison function receives two key and value pairs to compare (you
can sort by keys or values or their combination as needed).</p>
<p>Computes in <strong>O(n log n + c)</strong> time and <strong>O(n)</strong> space where <em>n</em> is
the length of the map and <em>c</em> the capacity. The sort is stable.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sorted_by" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#710-719">source</a><h4 class="code-header">pub fn <a href="#method.sorted_by" class="fn">sorted_by</a>&lt;F&gt;(self, cmp: F) -&gt; <a class="struct" href="struct.IntoIter.html" title="struct indexmap::map::IntoIter">IntoIter</a>&lt;K, V&gt; <a href="#" class="tooltip" data-notable-ty="IntoIter&lt;K, V&gt;">ⓘ</a><div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>,</div></h4></section></summary><div class="docblock"><p>Sort the key-value pairs of the map and return a by-value iterator of
the key-value pairs with the result.</p>
<p>The sort is stable.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_unstable_keys" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#725-732">source</a><h4 class="code-header">pub fn <a href="#method.sort_unstable_keys" class="fn">sort_unstable_keys</a>(&amp;mut self)<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section></summary><div class="docblock"><p>Sort the map’s key-value pairs by the default ordering of the keys, but
may not preserve the order of equal elements.</p>
<p>See <a href="struct.IndexMap.html#method.sort_unstable_by" title="method indexmap::map::IndexMap::sort_unstable_by"><code>sort_unstable_by</code></a> for details.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_unstable_by" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#742-749">source</a><h4 class="code-header">pub fn <a href="#method.sort_unstable_by" class="fn">sort_unstable_by</a>&lt;F&gt;(&amp;mut self, cmp: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>,</div></h4></section></summary><div class="docblock"><p>Sort the map’s key-value pairs in place using the comparison function <code>cmp</code>, but
may not preserve the order of equal elements.</p>
<p>The comparison function receives two key and value pairs to compare (you
can sort by keys or values or their combination as needed).</p>
<p>Computes in <strong>O(n log n + c)</strong> time where <em>n</em> is
the length of the map and <em>c</em> is the capacity. The sort is unstable.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sorted_unstable_by" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#756-765">source</a><h4 class="code-header">pub fn <a href="#method.sorted_unstable_by" class="fn">sorted_unstable_by</a>&lt;F&gt;(self, cmp: F) -&gt; <a class="struct" href="struct.IntoIter.html" title="struct indexmap::map::IntoIter">IntoIter</a>&lt;K, V&gt; <a href="#" class="tooltip" data-notable-ty="IntoIter&lt;K, V&gt;">ⓘ</a><div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>,</div></h4></section></summary><div class="docblock"><p>Sort the key-value pairs of the map and return a by-value iterator of
the key-value pairs with the result.</p>
<p>The sort is unstable.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.reverse" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#770-772">source</a><h4 class="code-header">pub fn <a href="#method.reverse" class="fn">reverse</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Reverses the order of the map’s key-value pairs in place.</p>
<p>Computes in <strong>O(n)</strong> time and <strong>O(1)</strong> space.</p>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IndexMap%3CK,+V,+S%3E-2" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#775-867">source</a><a href="#impl-IndexMap%3CK,+V,+S%3E-2" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.get_index" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#781-783">source</a><h4 class="code-header">pub fn <a href="#method.get_index" class="fn">get_index</a>(&amp;self, index: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>)&gt;</h4></section></summary><div class="docblock"><p>Get a key-value pair by index</p>
<p>Valid indices are <em>0 &lt;= index &lt; self.len()</em></p>
<p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_index_mut" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#790-792">source</a><h4 class="code-header">pub fn <a href="#method.get_index_mut" class="fn">get_index_mut</a>(&amp;mut self, index: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a>)&gt;</h4></section></summary><div class="docblock"><p>Get a key-value pair by index</p>
<p>Valid indices are <em>0 &lt;= index &lt; self.len()</em></p>
<p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.first" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#797-799">source</a><h4 class="code-header">pub fn <a href="#method.first" class="fn">first</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>)&gt;</h4></section></summary><div class="docblock"><p>Get the first key-value pair</p>
<p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.first_mut" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#804-806">source</a><h4 class="code-header">pub fn <a href="#method.first_mut" class="fn">first_mut</a>(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a>)&gt;</h4></section></summary><div class="docblock"><p>Get the first key-value pair, with mutable access to the value</p>
<p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.last" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#811-813">source</a><h4 class="code-header">pub fn <a href="#method.last" class="fn">last</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a>)&gt;</h4></section></summary><div class="docblock"><p>Get the last key-value pair</p>
<p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.last_mut" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#818-820">source</a><h4 class="code-header">pub fn <a href="#method.last_mut" class="fn">last_mut</a>(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a>)&gt;</h4></section></summary><div class="docblock"><p>Get the last key-value pair, with mutable access to the value</p>
<p>Computes in <strong>O(1)</strong> time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap_remove_index" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#831-833">source</a><h4 class="code-header">pub fn <a href="#method.swap_remove_index" class="fn">swap_remove_index</a>(&amp;mut self, index: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt;</h4></section></summary><div class="docblock"><p>Remove the key-value pair by index</p>
<p>Valid indices are <em>0 &lt;= index &lt; self.len()</em></p>
<p>Like <code>Vec::swap_remove</code>, the pair is removed by swapping it with the
last element of the map and popping it off. <strong>This perturbs
the position of what used to be the last element!</strong></p>
<p>Computes in <strong>O(1)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.shift_remove_index" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#844-846">source</a><h4 class="code-header">pub fn <a href="#method.shift_remove_index" class="fn">shift_remove_index</a>(&amp;mut self, index: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt;</h4></section></summary><div class="docblock"><p>Remove the key-value pair by index</p>
<p>Valid indices are <em>0 &lt;= index &lt; self.len()</em></p>
<p>Like <code>Vec::remove</code>, the pair is removed by shifting all of the
elements that follow it, preserving their relative order.
<strong>This perturbs the index of all of those elements!</strong></p>
<p>Computes in <strong>O(n)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.move_index" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#857-859">source</a><h4 class="code-header">pub fn <a href="#method.move_index" class="fn">move_index</a>(&amp;mut self, from: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, to: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Moves the position of a key-value pair from one index to another
by shifting all other pairs in-between.</p>
<ul>
<li>If <code>from &lt; to</code>, the other pairs will shift down while the targeted pair moves up.</li>
<li>If <code>from &gt; to</code>, the other pairs will shift up while the targeted pair moves down.</li>
</ul>
<p><em><strong>Panics</strong></em> if <code>from</code> or <code>to</code> are out of bounds.</p>
<p>Computes in <strong>O(n)</strong> time (average).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap_indices" class="method"><a class="src rightside" href="../../src/indexmap/map.rs.html#864-866">source</a><h4 class="code-header">pub fn <a href="#method.swap_indices" class="fn">swap_indices</a>(&amp;mut self, a: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, b: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Swaps the position of two key-value pairs in the map.</p>
<p><em><strong>Panics</strong></em> if <code>a</code> or <code>b</code> are out of bounds.</p>
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#81-98">source</a><a href="#impl-Clone-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#87-92">source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&amp;self) -&gt; Self</h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#94-97">source</a><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&amp;mut self, other: &amp;Self)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#126-141">source</a><a href="#impl-Debug-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#131-140">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.82.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1490-1498">source</a><a href="#impl-Default-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1495-1497">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -&gt; Self</h4></section></summary><div class="docblock"><p>Return an empty <code>IndexMap</code></p>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Extend%3C(%26K,+%26V)%3E-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1476-1488">source</a><a href="#impl-Extend%3C(%26K,+%26V)%3E-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html" title="trait core::iter::traits::collect::Extend">Extend</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;'a K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;'a V</a>)&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.extend-1" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1485-1487">source</a><a href="#method.extend-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#tymethod.extend" class="fn">extend</a>&lt;I: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = (<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;'a K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;'a V</a>)&gt;&gt;(&amp;mut self, iterable: I)</h4></section></summary><div class="docblock"><p>Extend the map with all key-value pairs in the iterable.</p>
<p>See the first extend method for more details.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_one-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#454">source</a><a href="#method.extend_one-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_one" class="fn">extend_one</a>(&amp;mut self, item: A)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Extends a collection with exactly one element.</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_reserve-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#462">source</a><a href="#method.extend_reserve-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve" class="fn">extend_reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Reserves capacity in a collection for the given number of additional elements. <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Extend%3C(K,+V)%3E-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1443-1474">source</a><a href="#impl-Extend%3C(K,+V)%3E-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html" title="trait core::iter::traits::collect::Extend">Extend</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.extend" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1457-1473">source</a><a href="#method.extend" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#tymethod.extend" class="fn">extend</a>&lt;I: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt;&gt;(&amp;mut self, iterable: I)</h4></section></summary><div class="docblock"><p>Extend the map with all key-value pairs in the iterable.</p>
<p>This is equivalent to calling <a href="#method.insert"><code>insert</code></a> for each of
them in order, which means that for keys that already existed
in the map, their value is updated but it keeps the existing order.</p>
<p>New keys are inserted in the order they appear in the sequence. If
equivalents of a key occur more than once, the last corresponding value
prevails.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_one" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#454">source</a><a href="#method.extend_one" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_one" class="fn">extend_one</a>(&amp;mut self, item: A)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Extends a collection with exactly one element.</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_reserve" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#462">source</a><a href="#method.extend_reserve" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve" class="fn">extend_reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Reserves capacity in a collection for the given number of additional elements. <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3C%5B(K,+V);+N%5D%3E-for-IndexMap%3CK,+V%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1425-1441">source</a><a href="#impl-From%3C%5B(K,+V);+N%5D%3E-for-IndexMap%3CK,+V%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, const N: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;[<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.array.html">N</a>]&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, <a class="struct" href="https://doc.rust-lang.org/1.82.0/std/hash/random/struct.RandomState.html" title="struct std::hash::random::RandomState">RandomState</a>&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1438-1440">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(arr: [<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.array.html">N</a>]) -&gt; Self</h4></section></summary><div class="docblock"><h5 id="examples-5"><a class="doc-anchor" href="#examples-5">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span>map1 = IndexMap::from([(<span class="number">1</span>, <span class="number">2</span>), (<span class="number">3</span>, <span class="number">4</span>)]);
<span class="kw">let </span>map2: IndexMap&lt;<span class="kw">_</span>, <span class="kw">_</span>&gt; = [(<span class="number">1</span>, <span class="number">2</span>), (<span class="number">3</span>, <span class="number">4</span>)].into();
<span class="macro">assert_eq!</span>(map1, map2);</code></pre></div>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-FromIterator%3C(K,+V)%3E-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1405-1422">source</a><a href="#impl-FromIterator%3C(K,+V)%3E-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.FromIterator.html" title="trait core::iter::traits::collect::FromIterator">FromIterator</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from_iter" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1415-1421">source</a><a href="#method.from_iter" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.FromIterator.html#tymethod.from_iter" class="fn">from_iter</a>&lt;I: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html">(K, V)</a>&gt;&gt;(iterable: I) -&gt; Self</h4></section></summary><div class="docblock"><p>Create an <code>IndexMap</code> from the sequence of key-value pairs in the
iterable.</p>
<p><code>from_iter</code> uses the same logic as <code>extend</code>. See
<a href="#method.extend"><code>extend</code></a> for more details.</p>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Index%3C%26Q%3E-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1265-1279">source</a><a href="#impl-Index%3C%26Q%3E-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, Q, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="docblock"><p>Access <code>IndexMap</code> values corresponding to a key.</p>
<h4 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = IndexMap::new();
<span class="kw">for </span>word <span class="kw">in </span><span class="string">"Lorem ipsum dolor sit amet"</span>.split_whitespace() {
map.insert(word.to_lowercase(), word.to_uppercase());
}
<span class="macro">assert_eq!</span>(map[<span class="string">"lorem"</span>], <span class="string">"LOREM"</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"ipsum"</span>], <span class="string">"IPSUM"</span>);</code></pre></div>
<div class="example-wrap should_panic"><a href="#" class="tooltip" title="This example panics">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = IndexMap::new();
map.insert(<span class="string">"foo"</span>, <span class="number">1</span>);
<span class="macro">println!</span>(<span class="string">"{:?}"</span>, map[<span class="string">"bar"</span>]); <span class="comment">// panics!</span></code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.index" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1276-1278">source</a><a href="#method.index" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html#tymethod.index" class="fn">index</a>(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a></h4></section></summary><div class="docblock"><p>Returns a reference to the value corresponding to the supplied <code>key</code>.</p>
<p><em><strong>Panics</strong></em> if <code>key</code> is not present in the map.</p>
</div></details><details class="toggle" open><summary><section id="associatedtype.Output" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1271">source</a><a href="#associatedtype.Output" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html#associatedtype.Output" class="associatedtype">Output</a> = V</h4></section></summary><div class='docblock'>The returned type after indexing.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Index%3Cusize%3E-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1352-1363">source</a><a href="#impl-Index%3Cusize%3E-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;</h3></section></summary><div class="docblock"><p>Access <code>IndexMap</code> values at indexed positions.</p>
<h4 id="examples-3"><a class="doc-anchor" href="#examples-3">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = IndexMap::new();
<span class="kw">for </span>word <span class="kw">in </span><span class="string">"Lorem ipsum dolor sit amet"</span>.split_whitespace() {
map.insert(word.to_lowercase(), word.to_uppercase());
}
<span class="macro">assert_eq!</span>(map[<span class="number">0</span>], <span class="string">"LOREM"</span>);
<span class="macro">assert_eq!</span>(map[<span class="number">1</span>], <span class="string">"IPSUM"</span>);
map.reverse();
<span class="macro">assert_eq!</span>(map[<span class="number">0</span>], <span class="string">"AMET"</span>);
<span class="macro">assert_eq!</span>(map[<span class="number">1</span>], <span class="string">"SIT"</span>);
map.sort_keys();
<span class="macro">assert_eq!</span>(map[<span class="number">0</span>], <span class="string">"AMET"</span>);
<span class="macro">assert_eq!</span>(map[<span class="number">1</span>], <span class="string">"DOLOR"</span>);</code></pre></div>
<div class="example-wrap should_panic"><a href="#" class="tooltip" title="This example panics">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = IndexMap::new();
map.insert(<span class="string">"foo"</span>, <span class="number">1</span>);
<span class="macro">println!</span>(<span class="string">"{:?}"</span>, map[<span class="number">10</span>]); <span class="comment">// panics!</span></code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.index-1" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1358-1362">source</a><a href="#method.index-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html#tymethod.index" class="fn">index</a>(&amp;self, index: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;V</a></h4></section></summary><div class="docblock"><p>Returns a reference to the value at the supplied <code>index</code>.</p>
<p><em><strong>Panics</strong></em> if <code>index</code> is out of bounds.</p>
</div></details><details class="toggle" open><summary><section id="associatedtype.Output-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1353">source</a><a href="#associatedtype.Output-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html#associatedtype.Output" class="associatedtype">Output</a> = V</h4></section></summary><div class='docblock'>The returned type after indexing.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IndexMut%3C%26Q%3E-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1310-1322">source</a><a href="#impl-IndexMut%3C%26Q%3E-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, Q, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.IndexMut.html" title="trait core::ops::index::IndexMut">IndexMut</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="docblock"><p>Access <code>IndexMap</code> values corresponding to a key.</p>
<p>Mutable indexing allows changing / updating values of key-value
pairs that are already present.</p>
<p>You can <strong>not</strong> insert new pairs with index syntax, use <code>.insert()</code>.</p>
<h4 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = IndexMap::new();
<span class="kw">for </span>word <span class="kw">in </span><span class="string">"Lorem ipsum dolor sit amet"</span>.split_whitespace() {
map.insert(word.to_lowercase(), word.to_string());
}
<span class="kw">let </span>lorem = <span class="kw-2">&amp;mut </span>map[<span class="string">"lorem"</span>];
<span class="macro">assert_eq!</span>(lorem, <span class="string">"Lorem"</span>);
lorem.retain(char::is_lowercase);
<span class="macro">assert_eq!</span>(map[<span class="string">"lorem"</span>], <span class="string">"orem"</span>);</code></pre></div>
<div class="example-wrap should_panic"><a href="#" class="tooltip" title="This example panics">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = IndexMap::new();
map.insert(<span class="string">"foo"</span>, <span class="number">1</span>);
map[<span class="string">"bar"</span>] = <span class="number">1</span>; <span class="comment">// panics!</span></code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.index_mut" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1319-1321">source</a><a href="#method.index_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.IndexMut.html#tymethod.index_mut" class="fn">index_mut</a>(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a></h4></section></summary><div class="docblock"><p>Returns a mutable reference to the value corresponding to the supplied <code>key</code>.</p>
<p><em><strong>Panics</strong></em> if <code>key</code> is not present in the map.</p>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IndexMut%3Cusize%3E-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1394-1403">source</a><a href="#impl-IndexMut%3Cusize%3E-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.IndexMut.html" title="trait core::ops::index::IndexMut">IndexMut</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;</h3></section></summary><div class="docblock"><p>Access <code>IndexMap</code> values at indexed positions.</p>
<p>Mutable indexing allows changing / updating indexed values
that are already present.</p>
<p>You can <strong>not</strong> insert new values with index syntax, use <code>.insert()</code>.</p>
<h4 id="examples-4"><a class="doc-anchor" href="#examples-4">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = IndexMap::new();
<span class="kw">for </span>word <span class="kw">in </span><span class="string">"Lorem ipsum dolor sit amet"</span>.split_whitespace() {
map.insert(word.to_lowercase(), word.to_string());
}
<span class="kw">let </span>lorem = <span class="kw-2">&amp;mut </span>map[<span class="number">0</span>];
<span class="macro">assert_eq!</span>(lorem, <span class="string">"Lorem"</span>);
lorem.retain(char::is_lowercase);
<span class="macro">assert_eq!</span>(map[<span class="string">"lorem"</span>], <span class="string">"orem"</span>);</code></pre></div>
<div class="example-wrap should_panic"><a href="#" class="tooltip" title="This example panics">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">use </span>indexmap::IndexMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = IndexMap::new();
map.insert(<span class="string">"foo"</span>, <span class="number">1</span>);
map[<span class="number">10</span>] = <span class="number">1</span>; <span class="comment">// panics!</span></code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.index_mut-1" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1398-1402">source</a><a href="#method.index_mut-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.IndexMut.html#tymethod.index_mut" class="fn">index_mut</a>(&amp;mut self, index: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a></h4></section></summary><div class="docblock"><p>Returns a mutable reference to the value at the supplied <code>index</code>.</p>
<p><em><strong>Panics</strong></em> if <code>index</code> is out of bounds.</p>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-%26IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1217-1223">source</a><a href="#impl-IntoIterator-for-%26IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for &amp;'a <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;</h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Item" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1218">source</a><a href="#associatedtype.Item" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" class="associatedtype">Item</a> = (<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;'a K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;'a V</a>)</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="toggle" open><summary><section id="associatedtype.IntoIter" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1219">source</a><a href="#associatedtype.IntoIter" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" class="associatedtype">IntoIter</a> = <a class="struct" href="struct.Iter.html" title="struct indexmap::map::Iter">Iter</a>&lt;'a, K, V&gt;</h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details><details class="toggle method-toggle" open><summary><section id="method.into_iter" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1220-1222">source</a><a href="#method.into_iter" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter" class="fn">into_iter</a>(self) -&gt; Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" title="type core::iter::traits::collect::IntoIterator::IntoIter">IntoIter</a></h4></section></summary><div class='docblock'>Creates an iterator from a value. <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-%26mut+IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1225-1231">source</a><a href="#impl-IntoIterator-for-%26mut+IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for &amp;'a mut <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;</h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Item-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1226">source</a><a href="#associatedtype.Item-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" class="associatedtype">Item</a> = (<a c
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="docblock"><p>Opt-in mutable access to keys.</p>
<p>See <a href="trait.MutableKeys.html"><code>MutableKeys</code></a> for more information.</p>
</div><div class="impl-items"><section id="associatedtype.Key" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/mutable_keys.rs.html#56">source</a><a href="#associatedtype.Key" class="anchor">§</a><h4 class="code-header">type <a href="trait.MutableKeys.html#associatedtype.Key" class="associatedtype">Key</a> = K</h4></section><section id="associatedtype.Value" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/mutable_keys.rs.html#57">source</a><a href="#associatedtype.Value" class="anchor">§</a><h4 class="code-header">type <a href="trait.MutableKeys.html#associatedtype.Value" class="associatedtype">Value</a> = V</h4></section><details class="toggle method-toggle" open><summary><section id="method.get_full_mut2" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/mutable_keys.rs.html#58-63">source</a><a href="#method.get_full_mut2" class="anchor">§</a><h4 class="code-header">fn <a href="trait.MutableKeys.html#tymethod.get_full_mut2" class="fn">get_full_mut2</a>&lt;Q&gt;(&amp;mut self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Q</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.usize.html">usize</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a>)&gt;<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Return item index, mutable reference to key and value</div></details><details class="toggle method-toggle" open><summary><section id="method.retain2" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/mutable_keys.rs.html#65-70">source</a><a href="#method.retain2" class="anchor">§</a><h4 class="code-header">fn <a href="trait.MutableKeys.html#tymethod.retain2" class="fn">retain2</a>&lt;F&gt;(&amp;mut self, keep: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut V</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class='docblock'>Scan through each key-value pair in the map and keep those where the
closure <code>keep</code> returns <code>true</code>. <a href="trait.MutableKeys.html#tymethod.retain2">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.__private_marker" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/mutable_keys.rs.html#72-74">source</a><a href="#method.__private_marker" class="anchor">§</a><h4 class="code-header">fn <a href="trait.MutableKeys.html#tymethod.__private_marker" class="fn">__private_marker</a>(&amp;self) -&gt; PrivateMarker</h4></section></summary><div class='docblock'>This method is not useful in itself – it is there to “seal” the trait
for external implementation, so that we can add methods without
causing breaking changes.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-PartialEq%3CIndexMap%3CK,+V2,+S2%3E%3E-for-IndexMap%3CK,+V1,+S1%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1500-1515">source</a><a href="#impl-PartialEq%3CIndexMap%3CK,+V2,+S2%3E%3E-for-IndexMap%3CK,+V1,+S1%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V1, S1, V2, S2&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>&lt;<a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V2, S2&gt;&gt; for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V1, S1&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
V1: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>&lt;V2&gt;,
S1: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,
S2: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1507-1514">source</a><a href="#method.eq" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.PartialEq.html#tymethod.eq" class="fn">eq</a>(&amp;self, other: &amp;<a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V2, S2&gt;) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.82.0/src/core/cmp.rs.html#261">source</a></span><a href="#method.ne" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.PartialEq.html#method.ne" class="fn">ne</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;Rhs</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>!=</code>. The default implementation is almost always sufficient,
and should not be overridden without very good reason.</div></details></div></details><section id="impl-Eq-for-IndexMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map.rs.html#1517-1523">source</a><a href="#impl-Eq-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-IndexMap%3CK,+V,+S%3E" class="impl"><a href="#impl-Freeze-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a>,</div></h3></section><section id="impl-RefUnwindSafe-for-IndexMap%3CK,+V,+S%3E" class="impl"><a href="#impl-RefUnwindSafe-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-IndexMap%3CK,+V,+S%3E" class="impl"><a href="#impl-Send-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h3></section><section id="impl-Sync-for-IndexMap%3CK,+V,+S%3E" class="impl"><a href="#impl-Sync-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,</div></h3></section><section id="impl-Unpin-for-IndexMap%3CK,+V,+S%3E" class="impl"><a href="#impl-Unpin-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-IndexMap%3CK,+V,+S%3E" class="impl"><a href="#impl-UnwindSafe-for-IndexMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, V, S&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.IndexMap.html" title="struct indexmap::map::IndexMap">IndexMap</a>&lt;K, V, S&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,</div></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/any.rs.html#138">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/any.rs.html#139">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#209">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#211">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#217">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#218">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-CloneToUninit-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/clone.rs.html#273">source</a><a href="#impl-CloneToUninit-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.CloneToUninit.html" title="trait core::clone::CloneToUninit">CloneToUninit</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone_to_uninit" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/clone.rs.html#275">source</a><a href="#method.clone_to_uninit" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit" class="fn">clone_to_uninit</a>(&amp;self, dst: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.pointer.html">*mut T</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>clone_to_uninit</code>)</span></div></span><div class='docblock'>Performs copy-assignment from <code>self</code> to <code>dst</code>. <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Equivalent%3CK%3E-for-Q" class="impl"><a class="src rightside" href="../../src/indexmap/equivalent.rs.html#18-27">source</a><a href="#impl-Equivalent%3CK%3E-for-Q" class="anchor">§</a><h3 class="code-header">impl&lt;Q, K&gt; <a class="trait" href="../trait.Equivalent.html" title="trait indexmap::Equivalent">Equivalent</a>&lt;K&gt; for Q<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;Q&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.equivalent" class="method trait-impl"><a class="src rightside" href="../../src/indexmap/equivalent.rs.html#24-26">source</a><a href="#method.equivalent" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Equivalent.html#tymethod.equivalent" class="fn">equivalent</a>(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;K</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Compare self to <code>key</code> and return <code>true</code> if they are equal.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/alloc/borrow.rs.html#82-84">source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/alloc/borrow.rs.html#86">source</a><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/alloc/borrow.rs.html#87">source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&amp;self) -&gt; T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/alloc/borrow.rs.html#91">source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&amp;self, target: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/std/primitive.reference.html">&amp;mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#809">source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#794">source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div><script type="text/json" id="notable-traits-data">{"Drain<'_, K, V>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Drain.html\" title=\"struct indexmap::map::Drain\">Drain</a>&lt;'_, K, V&gt;</code></h3><pre><code><div class=\"where\">impl&lt;K, V&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.82.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.Drain.html\" title=\"struct indexmap::map::Drain\">Drain</a>&lt;'_, K, V&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.82.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html\">(K, V)</a>;</div>","IntoIter<K, V>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.IntoIter.html\" title=\"struct indexmap::map::IntoIter\">IntoIter</a>&lt;K, V&gt;</code></h3><pre><code><div class=\"where\">impl&lt;K, V&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.82.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.IntoIter.html\" title=\"struct indexmap::map::IntoIter\">IntoIter</a>&lt;K, V&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.82.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.82.0/std/primitive.tuple.html\">(K, V)</a>;</div>","IntoKeys<K, V>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.IntoKeys.html\" title=\"struct indexmap::map::IntoKeys\">IntoKeys</a>&lt;K, V&gt;</code></h3><pre><code><div class=\"where\">impl&lt;K, V&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.82.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core:
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