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gobyexample/public/string-functions
Eli Bendersky e604254e38 Tweaks to other samples to accommodate strings-and-runes 
Add a link to the range sample, and remove partial mentions of this
topic in string-functions since it's now covered well in
strings-and-runes
2022-02-05 07:11:37 -08:00

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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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<a href="http://play.golang.org/p/pE_KNt12Zv9"><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>
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<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">&#34;fmt&#34;</span>
<span class="nx">s</span> <span class="s">&#34;strings&#34;</span>
<span class="p">)</span>
</pre>
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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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<pre class="chroma">
<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>
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<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
</pre>
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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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<pre class="chroma">
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;Contains: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">Contains</span><span class="p">(</span><span class="s">&#34;test&#34;</span><span class="p">,</span> <span class="s">&#34;es&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;Count: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">Count</span><span class="p">(</span><span class="s">&#34;test&#34;</span><span class="p">,</span> <span class="s">&#34;t&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;HasPrefix: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">HasPrefix</span><span class="p">(</span><span class="s">&#34;test&#34;</span><span class="p">,</span> <span class="s">&#34;te&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;HasSuffix: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">HasSuffix</span><span class="p">(</span><span class="s">&#34;test&#34;</span><span class="p">,</span> <span class="s">&#34;st&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;Index: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">Index</span><span class="p">(</span><span class="s">&#34;test&#34;</span><span class="p">,</span> <span class="s">&#34;e&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;Join: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">Join</span><span class="p">([]</span><span class="kt">string</span><span class="p">{</span><span class="s">&#34;a&#34;</span><span class="p">,</span> <span class="s">&#34;b&#34;</span><span class="p">},</span> <span class="s">&#34;-&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;Repeat: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">Repeat</span><span class="p">(</span><span class="s">&#34;a&#34;</span><span class="p">,</span> <span class="mi">5</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;Replace: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">Replace</span><span class="p">(</span><span class="s">&#34;foo&#34;</span><span class="p">,</span> <span class="s">&#34;o&#34;</span><span class="p">,</span> <span class="s">&#34;0&#34;</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;Replace: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">Replace</span><span class="p">(</span><span class="s">&#34;foo&#34;</span><span class="p">,</span> <span class="s">&#34;o&#34;</span><span class="p">,</span> <span class="s">&#34;0&#34;</span><span class="p">,</span> <span class="mi">1</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;Split: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">Split</span><span class="p">(</span><span class="s">&#34;a-b-c-d-e&#34;</span><span class="p">,</span> <span class="s">&#34;-&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;ToLower: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">ToLower</span><span class="p">(</span><span class="s">&#34;TEST&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="s">&#34;ToUpper: &#34;</span><span class="p">,</span> <span class="nx">s</span><span class="p">.</span><span class="nf">ToUpper</span><span class="p">(</span><span class="s">&#34;test&#34;</span><span class="p">))</span>
<span class="nf">p</span><span class="p">()</span>
<span class="p">}</span>
</pre>
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<td class="code">
<pre class="chroma"><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>
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<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> 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>
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