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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example: Sorting</title>
<link rel=stylesheet href="site.css">
</head>
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<body>
<div class="example" id="sorting">
<h2><a href="./">Go by Example</a>: Sorting</h2>
<table>
<tr>
<td class="docs">
<p>Go’s <code>sort</code> package implements sorting for builtins
and user-defined types. We’ll look at sorting for
builtins first.</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="http://play.golang.org/p/_gY0tANzJ4l"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">"fmt"</span>
<span class="s">"sort"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Sort methods are specific to the builtin type;
here’s an example for strings. Note that sorting is
in-place, so it changes the given slice and doesn’t
return a new one.</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">strs</span> <span class="o">:=</span> <span class="p">[]</span><span class="kt">string</span><span class="p">{</span><span class="s">"c"</span><span class="p">,</span> <span class="s">"a"</span><span class="p">,</span> <span class="s">"b"</span><span class="p">}</span>
<span class="nx">sort</span><span class="p">.</span><span class="nf">Strings</span><span class="p">(</span><span class="nx">strs</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"Strings:"</span><span class="p">,</span> <span class="nx">strs</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>An example of sorting <code>int</code>s.</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">ints</span> <span class="o">:=</span> <span class="p">[]</span><span class="kt">int</span><span class="p">{</span><span class="mi">7</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">}</span>
<span class="nx">sort</span><span class="p">.</span><span class="nf">Ints</span><span class="p">(</span><span class="nx">ints</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"Ints: "</span><span class="p">,</span> <span class="nx">ints</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>We can also use <code>sort</code> to check if a slice is
already in sorted order.</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nx">s</span> <span class="o">:=</span> <span class="nx">sort</span><span class="p">.</span><span class="nf">IntsAreSorted</span><span class="p">(</span><span class="nx">ints</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"Sorted: "</span><span class="p">,</span> <span class="nx">s</span><span class="p">)</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
<p>Running our program prints the sorted string and int
slices and <code>true</code> as the result of our <code>AreSorted</code> test.</p>
</td>
<td class="code">
<pre class="chroma">
<span class="gp">$</span> go run sorting.go
<span class="go">Strings: [a b c]
</span><span class="go">Ints: [2 4 7]
</span><span class="go">Sorted: true</span></pre>
</td>
</tr>
</table>
<p class="next">
Next example: <a href="sorting-by-functions">Sorting by Functions</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> and <a href="https://eli.thegreenplace.net">Eli Bendersky</a> | <a href="https://github.com/mmcgrana/gobyexample">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
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