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    <title>Go by Example မြန်မာဘာသာ: Switch</title>
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      <h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Switch</h2>
      
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          <td class="docs">
            <p><em>Switch statements</em> တွေက expression တွေကိုသုံးပြီး conditionals တွေကိုစစ်တာပေါ့။</p>

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            <a href="https://go.dev/play/p/KmllDtzTSG9"><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>
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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="s">&#34;time&#34;</span>
<span class="p">)</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>
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          <td class="docs">
            <p>ဒီမှာ ဥပမာ အခြေခံ <code>switch</code> တခုအသုံးပြုပုံ</p>

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          <pre class="chroma">
    <span class="nx">i</span> <span class="o">:=</span> <span class="mi">2</span>
    <span class="nx">fmt</span><span class="p">.</span><span class="nf">Print</span><span class="p">(</span><span class="s">&#34;Write &#34;</span><span class="p">,</span> <span class="nx">i</span><span class="p">,</span> <span class="s">&#34; as &#34;</span><span class="p">)</span>
    <span class="k">switch</span> <span class="nx">i</span> <span class="p">{</span>
    <span class="k">case</span> <span class="mi">1</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">&#34;one&#34;</span><span class="p">)</span>
    <span class="k">case</span> <span class="mi">2</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">&#34;two&#34;</span><span class="p">)</span>
    <span class="k">case</span> <span class="mi">3</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">&#34;three&#34;</span><span class="p">)</span>
    <span class="p">}</span>
</pre>
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            <p>expression နှစ်ခု သုံးခုစစ်ဖို့ comma သုံးပြီးစစ်နိုင်ပါတယ်။
ကျနော်တို့ဒီဥပမာဆိုရင် မဖြစ်မနေသုံးဖို့တော့မလိုတဲ့
<code>default</code> ကိုသုံးထားပါတယ်။</p>

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          <pre class="chroma">
    <span class="k">switch</span> <span class="nx">time</span><span class="p">.</span><span class="nf">Now</span><span class="p">().</span><span class="nf">Weekday</span><span class="p">()</span> <span class="p">{</span>
    <span class="k">case</span> <span class="nx">time</span><span class="p">.</span><span class="nx">Saturday</span><span class="p">,</span> <span class="nx">time</span><span class="p">.</span><span class="nx">Sunday</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">&#34;It&#39;s the weekend&#34;</span><span class="p">)</span>
    <span class="k">default</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">&#34;It&#39;s a weekday&#34;</span><span class="p">)</span>
    <span class="p">}</span>
</pre>
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          <td class="docs">
            <p>ကျနော်တို့ <code>switch</code> ကို expression မပါဘဲနှင့်သုံးမယ်ဆိုရင်
if/else logic လိုမျိုးသုံးလို့ရတယ်။ ဒီဥပမာမှာဆိုရင် ကျနော်တို့စစ်တဲ့
case က constant (ပုံသေ) မဟုတ်ဘူးဆိုတာကိုပြထားတယ်။</p>

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          <pre class="chroma">
    <span class="nx">t</span> <span class="o">:=</span> <span class="nx">time</span><span class="p">.</span><span class="nf">Now</span><span class="p">()</span>
    <span class="k">switch</span> <span class="p">{</span>
    <span class="k">case</span> <span class="nx">t</span><span class="p">.</span><span class="nf">Hour</span><span class="p">()</span> <span class="p">&lt;</span> <span class="mi">12</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">&#34;It&#39;s before noon&#34;</span><span class="p">)</span>
    <span class="k">default</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">&#34;It&#39;s after noon&#34;</span><span class="p">)</span>
    <span class="p">}</span>
</pre>
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            <p>ကျနော်တို့ <code>switch</code> ကို types တွေအတွက်လဲအသုံးပြုတယ်။ သူကတော့
type ကိုဘဲစစ်လိမ့်မယ်။ ဒီဥပမာမှာဆိုရင် varaible t က i ရဲ့
type ကိုစစ်တာပေါ့။</p>

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          <pre class="chroma">
    <span class="nx">whatAmI</span> <span class="o">:=</span> <span class="kd">func</span><span class="p">(</span><span class="nx">i</span> <span class="kd">interface</span><span class="p">{})</span> <span class="p">{</span>
        <span class="k">switch</span> <span class="nx">t</span> <span class="o">:=</span> <span class="nx">i</span><span class="p">.(</span><span class="kd">type</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">case</span> <span class="kt">bool</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">&#34;I&#39;m a bool&#34;</span><span class="p">)</span>
        <span class="k">case</span> <span class="kt">int</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">&#34;I&#39;m an int&#34;</span><span class="p">)</span>
        <span class="k">default</span><span class="p">:</span>
            <span class="nx">fmt</span><span class="p">.</span><span class="nf">Printf</span><span class="p">(</span><span class="s">&#34;Don&#39;t know type %T\n&#34;</span><span class="p">,</span> <span class="nx">t</span><span class="p">)</span>
        <span class="p">}</span>
    <span class="p">}</span>
    <span class="nf">whatAmI</span><span class="p">(</span><span class="kc">true</span><span class="p">)</span>
    <span class="nf">whatAmI</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
    <span class="nf">whatAmI</span><span class="p">(</span><span class="s">&#34;hey&#34;</span><span class="p">)</span>
<span class="p">}</span>
</pre>
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          <pre class="chroma"><span class="gp">$</span> go run switch.go
<span class="go">Write 2 as two
</span><span class="go">It&#39;s a weekday
</span><span class="go">It&#39;s after noon
</span><span class="go">I&#39;m a bool
</span><span class="go">I&#39;m an int
</span><span class="go">Don&#39;t know type string</span></pre>
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      <p class="next">
        နောက်ဥပမာ: <a href="arrays">Arrays</a>.
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      by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> နှင့် <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>
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