public/methods

<!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") {
              window.location.href = 'interfaces';
          }
          
      }
  </script>
  <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">&#34;fmt&#34;</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">&#34;area: &#34;</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">&#34;perim:&#34;</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">&amp;</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">&#34;area: &#34;</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">&#34;perim:&#34;</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>
      var codeLines = [];
      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('');
    </script>
    <script src="site.js" async></script>
  </body>
</html>