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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example မြန်မာဘာသာ: Methods</title>
<link rel=stylesheet href="site.css">
</head>
<script>
onkeydown = (e) => {
if (e.key == "ArrowLeft") {
window.location.href = 'structs';
}
if (e.key == "ArrowRight") {
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<body>
<div class="example" id="methods">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Methods</h2>
<table>
<tr>
<td class="docs">
<p>Go က struct types တွေအပေါ်မှာ သတ်မှတ်တဲ့ <em>methods</em> တွေကို support လုပ်ပါတယ်။</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="https://go.dev/play/p/KlFp9bXVV7P"><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="s">"fmt"</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">type</span> <span class="nx">rect</span> <span class="kd">struct</span> <span class="p">{</span>
<span class="nx">width</span><span class="p">,</span> <span class="nx">height</span> <span class="kt">int</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီ <code>area</code> method မှာ <code>*rect</code> ဆိုတဲ့ <em>receiver type</em> ရှိပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="p">(</span><span class="nx">r</span> <span class="o">*</span><span class="nx">rect</span><span class="p">)</span> <span class="nf">area</span><span class="p">()</span> <span class="kt">int</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">r</span><span class="p">.</span><span class="nx">width</span> <span class="o">*</span> <span class="nx">r</span><span class="p">.</span><span class="nx">height</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Method တွေကို pointer သို့မဟုတ် value receiver types နှစ်မျိုးစလုံးအတွက် သတ်မှတ်နိုင်ပါတယ်။
ဒီမှာ value receiver ရဲ့ ဥပမာတစ်ခုကို ပြထားပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="p">(</span><span class="nx">r</span> <span class="nx">rect</span><span class="p">)</span> <span class="nf">perim</span><span class="p">()</span> <span class="kt">int</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">2</span><span class="o">*</span><span class="nx">r</span><span class="p">.</span><span class="nx">width</span> <span class="o">+</span> <span class="mi">2</span><span class="o">*</span><span class="nx">r</span><span class="p">.</span><span class="nx">height</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>
<span class="nx">r</span> <span class="o">:=</span> <span class="nx">rect</span><span class="p">{</span><span class="nx">width</span><span class="p">:</span> <span class="mi">10</span><span class="p">,</span> <span class="nx">height</span><span class="p">:</span> <span class="mi">5</span><span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီမှာ ကျွန်တော်တို့ရဲ့ struct အတွက် သတ်မှတ်ထားတဲ့ method နှစ်ခုကို ခေါ်သုံးပါတယ်။</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="s">"area: "</span><span class="p">,</span> <span class="nx">r</span><span class="p">.</span><span class="nf">area</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">"perim:"</span><span class="p">,</span> <span class="nx">r</span><span class="p">.</span><span class="nf">perim</span><span class="p">())</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Go က method တွေကို ခေါ်တဲ့အခါ value နဲ့ pointer ကြား အလိုအလျောက် ပြောင်းလဲပေးပါတယ်။
သင့်အနေနဲ့ method ခေါ်တဲ့အခါ copy လုပ်တာကို ရှောင်ရှားချင်ရင် သို့မဟုတ်
method က receiving struct ကို ပြောင်းလဲခွင့်ပေးချင်ရင်
pointer receiver type ကို သုံးချင်နိုင်ပါတယ်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nx">rp</span> <span class="o">:=</span> <span class="o">&</span><span class="nx">r</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"area: "</span><span class="p">,</span> <span class="nx">rp</span><span class="p">.</span><span class="nf">area</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">"perim:"</span><span class="p">,</span> <span class="nx">rp</span><span class="p">.</span><span class="nf">perim</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 methods.go
<span class="go">area: 50
</span><span class="go">perim: 30
</span><span class="go">area: 50
</span><span class="go">perim: 30</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>နောက်တစ်ဆင့်မှာ ဆက်စပ်နေတဲ့ method တွေကို ပေါင်းပီး
အမည်ပေး (naming) လုပ်တဲ့ Go ရဲ့ interface
တွေအကြောင်း ကြည့်ကြပါမယ်။</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<p class="next">
နောက်ဥပမာ: <a href="interfaces">Interfaces</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>
<script>
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codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('type rect struct {\u000A width, height int\u000A}\u000A');codeLines.push('func (r *rect) area() int {\u000A return r.width * r.height\u000A}\u000A');codeLines.push('func (r rect) perim() int {\u000A return 2*r.width + 2*r.height\u000A}\u000A');codeLines.push('func main() {\u000A r :\u003D rect{width: 10, height: 5}\u000A');codeLines.push(' fmt.Println(\"area: \", r.area())\u000A fmt.Println(\"perim:\", r.perim())\u000A');codeLines.push(' rp :\u003D \u0026r\u000A fmt.Println(\"area: \", rp.area())\u000A fmt.Println(\"perim:\", rp.perim())\u000A}\u000A');codeLines.push('');codeLines.push('');
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