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<article class="main-content">
<section class="section">
<div class="section-content top-matter">
<h1>Stack</h1>
<div class="declaration">
<div class="language">
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">struct</span> <span class="kt">Stack</span><span class="o">&lt;</span><span class="kt">Element</span><span class="o">&gt;</span></code></pre>
<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">Stack</span><span class="p">:</span> <span class="kt">Sequence</span></code></pre>
<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">Stack</span><span class="p">:</span> <span class="kt">CustomDebugStringConvertible</span> <span class="k">where</span> <span class="kt">Element</span><span class="p">:</span> <span class="kt">CustomDebugStringConvertible</span></code></pre>
</div>
</div>
<p>A basic stack type implementing the LIFO principle - only the last inserted element can be accessed and removed.</p>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L2-L50">Show on GitHub</a>
</div>
</div>
</section>
<section class="section">
<div class="section-content">
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore5StackVACyxGycfc"></a>
<a name="//apple_ref/swift/Method/init()" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore5StackVACyxGycfc">init()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Creates an empty <code>Stack</code>.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">()</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L6">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore5StackV5countSivp"></a>
<a name="//apple_ref/swift/Property/count" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore5StackV5countSivp">count</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The number of elements in this stack.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">count</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L9-L11">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore5StackV4pushyyxF"></a>
<a name="//apple_ref/swift/Method/push(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore5StackV4pushyyxF">push(_:<wbr>)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Pushes (appends) an element onto the stack.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">mutating</span> <span class="kd">func</span> <span class="nf">push</span><span class="p">(</span><span class="n">_</span> <span class="nv">element</span><span class="p">:</span> <span class="kt">Element</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>element</em>
</code>
</td>
<td>
<div>
<p>The element to push onto the stack.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L16-L18">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore5StackV3popxSgyF"></a>
<a name="//apple_ref/swift/Method/pop()" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore5StackV3popxSgyF">pop()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Removes and returns the last element of the stack.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">@discardableResult</span>
<span class="kd">public</span> <span class="k">mutating</span> <span class="kd">func</span> <span class="nf">pop</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kt">Element</span><span class="p">?</span></code></pre>
</div>
</div>
<div>
<h4>Return Value</h4>
<p>The last element of the stack if the stack is not empty; otherwise, nil.</p>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L24-L26">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore5StackV4peekxSgyF"></a>
<a name="//apple_ref/swift/Method/peek()" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore5StackV4peekxSgyF">peek()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the last element of the stack if the stack is not empty; otherwise, nil.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">peek</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kt">Element</span><span class="p">?</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L29-L31">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore5StackV8contains5whereS2bxXE_tF"></a>
<a name="//apple_ref/swift/Method/contains(where:)" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore5StackV8contains5whereS2bxXE_tF">contains(where:<wbr>)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Check whether the sequence contains an element that satisfies the given predicate.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">contains</span><span class="p">(</span><span class="k">where</span> <span class="nv">predicate</span><span class="p">:</span> <span class="p">(</span><span class="kt">Element</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>predicate</em>
</code>
</td>
<td>
<div>
<p>A closure that takes an element of the sequence
and returns whether it represents a match.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p><code>true</code> if the sequence contains an element that satisfies <code>predicate</code>.</p>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L38-L40">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore5StackV10modifyLast2byyyxzXE_tF"></a>
<a name="//apple_ref/swift/Method/modifyLast(by:)" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore5StackV10modifyLast2byyyxzXE_tF">modifyLast(by:<wbr>)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Modify the last element.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">mutating</span> <span class="kd">func</span> <span class="nf">modifyLast</span><span class="p">(</span><span class="n">by</span> <span class="nv">modifier</span><span class="p">:</span> <span class="p">(</span><span class="k">inout</span> <span class="kt">Element</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Void</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>modifier</em>
</code>
</td>
<td>
<div>
<p>A function to be applied to the last element to modify the same in place.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L45-L49">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:ST12makeIterator0B0QzyF"></a>
<a name="//apple_ref/swift/Method/makeIterator()" class="dashAnchor"></a>
<a class="token" href="#/s:ST12makeIterator0B0QzyF">makeIterator()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">makeIterator</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="p">[</span><span class="kt">Element</span><span class="p">]</span><span class="o">.</span><span class="kt">Iterator</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L53-L55">Show on GitHub</a>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/Available%20where%20%60Element%60%3A%20%60CustomDebugStringConvertible%60"></a>
<a name="//apple_ref/swift/Section/Available where `Element`: `CustomDebugStringConvertible`" class="dashAnchor"></a>
<div class="section-name-container">
<a class="section-name-link" href="#/Available%20where%20%60Element%60%3A%20%60CustomDebugStringConvertible%60"></a>
<h3 class="section-name"><span>Available where <code>Element</code>: <code>CustomDebugStringConvertible</code></span>
</h3>
</div>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:s28CustomDebugStringConvertibleP16debugDescriptionSSvp"></a>
<a name="//apple_ref/swift/Property/debugDescription" class="dashAnchor"></a>
<a class="token" href="#/s:s28CustomDebugStringConvertibleP16debugDescriptionSSvp">debugDescription</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Helpers/Stack.swift#L59-L67">Show on GitHub</a>
</div>
</section>
</div>
</li>
</ul>
</div>
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</section>
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