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Eli Bendersky baf22e84e7 Move <img> for play.golang.org to separate line in the template 
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hash/link, but the image data stays the same.

Note that there are whitespace diffs in the generated files where there
is no image. This is because there was a stray tab in the template before,
and now it's replaced by spaces.

Fixes #235
2019-06-04 19:03:37 -07:00

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<!DOCTYPE html>
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<title>Go by Example: String Functions</title>
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<div class="example" id="string-functions">
<h2><a href="./">Go by Example</a>: String Functions</h2>
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<td class="docs">
<p>The standard library&rsquo;s <code>strings</code> package provides many
useful string-related functions. Here are some examples
to give you a sense of the package.</p>
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<td class="code empty leading">
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<td class="code leading">
<a href="http://play.golang.org/p/Vn4D3y4_711">
<img title="Run code" class="run" src="data:image/png;base64,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" />
</a>
<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
</pre></div>
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<div class="highlight"><pre><span class="kn">import</span> <span class="nx">s</span> <span class="s">&quot;strings&quot;</span>
<span class="kn">import</span> <span class="s">&quot;fmt&quot;</span>
</pre></div>
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<td class="docs">
<p>We alias <code>fmt.Println</code> to a shorter name as we&rsquo;ll use
it a lot below.</p>
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<td class="code leading">
<div class="highlight"><pre><span class="kd">var</span> <span class="nx">p</span> <span class="p">=</span> <span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span>
</pre></div>
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</td>
<td class="code leading">
<div class="highlight"><pre><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span>
</pre></div>
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<td class="docs">
<p>Here&rsquo;s a sample of the functions available in
<code>strings</code>. Since these are functions from the
package, not methods on the string object itself,
we need pass the string in question as the first
argument to the function. You can find more
functions in the <a href="http://golang.org/pkg/strings/"><code>strings</code></a>
package docs.</p>
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<td class="code leading">
<div class="highlight"><pre> <span class="nx">p</span><span class="p">(</span><span class="s">&quot;Contains: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">Contains</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span> <span class="s">&quot;es&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;Count: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">Count</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span> <span class="s">&quot;t&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;HasPrefix: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">HasPrefix</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span> <span class="s">&quot;te&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;HasSuffix: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">HasSuffix</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span> <span class="s">&quot;st&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;Index: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">Index</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">,</span> <span class="s">&quot;e&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;Join: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">Join</span><span class="p">([]</span><span class="kt">string</span><span class="p">{</span><span class="s">&quot;a&quot;</span><span class="p">,</span> <span class="s">&quot;b&quot;</span><span class="p">},</span> <span class="s">&quot;-&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;Repeat: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">Repeat</span><span class="p">(</span><span class="s">&quot;a&quot;</span><span class="p">,</span> <span class="mi">5</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;Replace: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">Replace</span><span class="p">(</span><span class="s">&quot;foo&quot;</span><span class="p">,</span> <span class="s">&quot;o&quot;</span><span class="p">,</span> <span class="s">&quot;0&quot;</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;Replace: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">Replace</span><span class="p">(</span><span class="s">&quot;foo&quot;</span><span class="p">,</span> <span class="s">&quot;o&quot;</span><span class="p">,</span> <span class="s">&quot;0&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;Split: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">Split</span><span class="p">(</span><span class="s">&quot;a-b-c-d-e&quot;</span><span class="p">,</span> <span class="s">&quot;-&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;ToLower: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">ToLower</span><span class="p">(</span><span class="s">&quot;TEST&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;ToUpper: &quot;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nx">ToUpper</span><span class="p">(</span><span class="s">&quot;test&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">()</span>
</pre></div>
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<td class="docs">
<p>Not part of <code>strings</code>, but worth mentioning here, are
the mechanisms for getting the length of a string in
bytes and getting a byte by index.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">p</span><span class="p">(</span><span class="s">&quot;Len: &quot;</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="s">&quot;hello&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="s">&quot;Char:&quot;</span><span class="p">,</span> <span class="s">&quot;hello&quot;</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="p">}</span>
</pre></div>
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<td class="docs">
<p>Note that <code>len</code> and indexing above work at the byte level.
Go uses UTF-8 encoded strings, so this is often useful
as-is. If you&rsquo;re working with potentially multi-byte
characters you&rsquo;ll want to use encoding-aware operations.
See <a href="https://blog.golang.org/strings">strings, bytes, runes and characters in Go</a>
for more information.</p>
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<td class="code leading">
<div class="highlight"><pre><span class="gp">$</span> go run string-functions.go
<span class="go">Contains: true</span>
<span class="go">Count: 2</span>
<span class="go">HasPrefix: true</span>
<span class="go">HasSuffix: true</span>
<span class="go">Index: 1</span>
<span class="go">Join: a-b</span>
<span class="go">Repeat: aaaaa</span>
<span class="go">Replace: f00</span>
<span class="go">Replace: f0o</span>
<span class="go">Split: [a b c d e]</span>
<span class="go">ToLower: test</span>
<span class="go">ToUpper: TEST</span>
</pre></div>
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<td class="docs">
</td>
<td class="code">
<div class="highlight"><pre><span class="go">Len: 5</span>
<span class="go">Char: 101</span>
</pre></div>
</td>
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</table>
<p class="next">
Next example: <a href="string-formatting">String Formatting</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> | <a href="https://github.com/mmcgrana/gobyexample/blob/master/examples/string-functions">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
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