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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example မြန်မာဘာသာ: Closures</title>
<link rel=stylesheet href="site.css">
</head>
<script>
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<body>
<div class="example" id="closures">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Closures</h2>
<table>
<tr>
<td class="docs">
<p>Go က <a href="https://en.wikipedia.org/wiki/Anonymous_function"><em>anonymous functions</em></a> တွေကို support လုပ်ပါတယ်၊
ဒီ Anonymous (အမည်မပါသော) function တွေသုံးပီးတော့ <a href="https://en.wikipedia.org/wiki/Closure_(computer_science)"><em>closures</em></a> တွေကို
တည်ဆောက်တယ်။ Anonymous function တွေက function တွေကိုအမည်မပါဘဲသုံးချင်တဲ့အချိန်မှာအတော်လေးအသုံးဝင်တယ်။</p>
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<td class="code empty leading">
</td>
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<td class="docs">
</td>
<td class="code leading">
<a href="https://go.dev/play/p/D-Jg-WfxYJK"><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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<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="s">"fmt"</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီ <code>intSeq</code> ဆိုတဲ့ function ကနောက်ထက် function တခုကို return ပြန်ထားတယ်၊
အဲ့ function က <code>intSeq</code> ရဲ့ body ထဲမှာအမည်မပါတဲ့ function တခုသတ်မှတ်ထားတယ်။
အဲ့မှာအမည်မပါဘဲသတ်မှတ်ထားတဲ့ function က <code>i</code> variable ကို <em>close over</em> လုပ်ပီးတော့
closure တခုတည်ဆောက်လိုက်တယ်။
ဒါကဘာကိုဆိုလိုတာလဲဆိုရင် <code>intSeq</code> ကိုခေါ်ပီးတော့ Anonymous function ကို
return ပြန်ပီးတာတောင် return ပြန်လိုက်တဲ့ Anonymous function က <code>intSeq</code> ရဲ့ <code>i</code> variable ကို access
ရနေသေးတယ်ဆိုတာကိုပြောချင်တာပါ။</p>
</td>
<td class="code empty leading">
</td>
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<td class="docs">
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<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">intSeq</span><span class="p">()</span> <span class="kd">func</span><span class="p">()</span> <span class="kt">int</span> <span class="p">{</span>
<span class="nx">i</span> <span class="o">:=</span> <span class="mi">0</span>
<span class="k">return</span> <span class="kd">func</span><span class="p">()</span> <span class="kt">int</span> <span class="p">{</span>
<span class="nx">i</span><span class="o">++</span>
<span class="k">return</span> <span class="nx">i</span>
<span class="p">}</span>
<span class="p">}</span>
</pre>
</td>
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<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>ကျနော်တို့ <code>intSeq</code> ကိုခေါ်ပီးတော့ return ပြန်လိုက်တဲ့ Anonymous function ကို
<code>nextInt</code> ဆိုတဲ့ variable ထဲမှာထည့်သွင်းထားတယ်၊ ဒီ function ကသူ့ထဲက value ဖြစ်တဲ့
i ကို capture လုပ်ပီးတော့ <code>nextInt</code> ကိုခေါ်တိုင်း အဲ့ဒီ့ i တန်ဖိုးကို update လုပ်ပေးတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">nextInt</span> <span class="o">:=</span> <span class="nf">intSeq</span><span class="p">()</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>closure ရဲ့ကျိုးသတ်ရောက်မှူကိုမြင်ဖို့ <code>nextInt</code> ကိုအနည်းငယ်ခေါ်ကြည့်လိုက်ကြရအောင်</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nf">nextInt</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="nf">nextInt</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="nf">nextInt</span><span class="p">())</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီ function တခုထဲကိုဘဲဒီ state သတ်ရောက်နေတယ်ဆိုသေချာဖို့ရာအတွက်
အသစ်တခုတည်ဆောက်ပီး စမ်းကြည့်လိုက်ကြရအောင်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nx">newInts</span> <span class="o">:=</span> <span class="nf">intSeq</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="nf">newInts</span><span class="p">())</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="gp">$</span> go run closures.go
<span class="go">1
</span><span class="go">2
</span><span class="go">3
</span><span class="go">1</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>The last feature of functions we’ll look at for now is
recursion.</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<p class="next">
နောက်ဥပမာ: <a href="recursion">Recursion</a>.
</p>
<p class="footer">
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>
</p>
</div>
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