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<!DOCTYPE html>
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<title>Go by Example မြန်မာဘာသာ: Range</title>
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<div class="example" id="range">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Range</h2>
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<td class="docs">
<p><em>range</em> က data structures တော်တော်များများရဲ့ elements တွေကို
iterate လုပ်တဲ့နေရာမှာသုံးတာပါ။ <code>range</code> ကိုကျနော်တို့လေ့လာထားတဲ့
data structures တွေမှာဘယ်လိုသုံးမလဲဆိုတာာအောက်မှာတချက်ကြည့်လိုက်ရအောင်။</p>
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<td class="code empty leading">
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<td class="docs">
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<td class="code leading">
<a href="https://go.dev/play/p/OB5Q9uS61yk"><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">
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<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="s">"fmt"</span>
</pre>
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<td class="docs">
<p>ဒီမှာကျနော်တို့ slice ထဲမှာရှိတဲ့နံပါတ်တွေကို <code>range</code> ကို သုံးပီး ပေါင်းပြထားပါတယ်။
Array တွေလဲအဲ့လိုဘဲ အသုံးပြုပြီးပေါင်းနိုင်ပါတယ်။</p>
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<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>
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<td class="docs">
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<pre class="chroma"> <span class="nx">nums</span> <span class="o">:=</span> <span class="p">[]</span><span class="kt">int</span><span class="p">{</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">}</span>
<span class="nx">sum</span> <span class="o">:=</span> <span class="mi">0</span>
<span class="k">for</span> <span class="nx">_</span><span class="p">,</span> <span class="nx">num</span> <span class="o">:=</span> <span class="k">range</span> <span class="nx">nums</span> <span class="p">{</span>
<span class="nx">sum</span> <span class="o">+=</span> <span class="nx">num</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">"sum:"</span><span class="p">,</span> <span class="nx">sum</span><span class="p">)</span>
</pre>
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<td class="docs">
<p>arrays နှင့် slices တွေကို <code>range</code> ဖြင့်အသုံးပြုရင် index နှင့် value နှစ်ခုလုံးပါပါတယ်။
အပေါ်ကနမူနာမှာဆိုရင် ကျနော်တို့ index မလိုတဲ့အတွက် <code>_</code> ကိုသုံးပီးတော့ ignored လုပ်ခဲ့ပါတယ်။
တခါတလေကျရင်တော့ indexs တွေကိုအသုံးပြုဖို့လိုအပ်ပါတယ်။</p>
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<td class="code leading">
<pre class="chroma">
<span class="k">for</span> <span class="nx">i</span><span class="p">,</span> <span class="nx">num</span> <span class="o">:=</span> <span class="k">range</span> <span class="nx">nums</span> <span class="p">{</span>
<span class="k">if</span> <span class="nx">num</span> <span class="o">==</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">"index:"</span><span class="p">,</span> <span class="nx">i</span><span class="p">)</span>
<span class="p">}</span>
<span class="p">}</span>
</pre>
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<td class="docs">
<p><code>range</code> ကို map မှာအသုံးပြုပီးတော့ key/value pairs ကို iterate လုပ်ပြတာပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">kvs</span> <span class="o">:=</span> <span class="kd">map</span><span class="p">[</span><span class="kt">string</span><span class="p">]</span><span class="kt">string</span><span class="p">{</span><span class="s">"a"</span><span class="p">:</span> <span class="s">"apple"</span><span class="p">,</span> <span class="s">"b"</span><span class="p">:</span> <span class="s">"banana"</span><span class="p">}</span>
<span class="k">for</span> <span class="nx">k</span><span class="p">,</span> <span class="nx">v</span> <span class="o">:=</span> <span class="k">range</span> <span class="nx">kvs</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">"%s -> %s\n"</span><span class="p">,</span> <span class="nx">k</span><span class="p">,</span> <span class="nx">v</span><span class="p">)</span>
<span class="p">}</span>
</pre>
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<td class="docs">
<p><code>range</code> ကိုသုံးပီးတော့ map ထဲမှာရှိတဲ့ keys တွေကိုဘဲ iterate လုပ်နိုင်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="k">for</span> <span class="nx">k</span> <span class="o">:=</span> <span class="k">range</span> <span class="nx">kvs</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">"key:"</span><span class="p">,</span> <span class="nx">k</span><span class="p">)</span>
<span class="p">}</span>
</pre>
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<td class="docs">
<p><code>range</code> ကိုသုံးပီးတော့ string ထဲမှာရှိတဲ့ unicode code points တွေကို iterate လုပ်နိုင်ပါတယ်။
ပထမ value ကတော့ character <code>rune</code> ရဲ့ starting byte index ပါပဲ။ ဒါတိယ value ကတော့ character <code>rune</code> ပါ။
အသေးစိတ်ကို <a href="strings-and-runes">Strings and Runes</a> မှာကြည့်နိုင်ပါတယ်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="k">for</span> <span class="nx">i</span><span class="p">,</span> <span class="nx">c</span> <span class="o">:=</span> <span class="k">range</span> <span class="s">"go"</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="nx">i</span><span class="p">,</span> <span class="nx">c</span><span class="p">)</span>
<span class="p">}</span>
<span class="p">}</span>
</pre>
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</table>
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<td class="docs">
</td>
<td class="code">
<pre class="chroma"><span class="gp">$</span> go run range.go
<span class="go">sum: 9
</span><span class="go">index: 1
</span><span class="go">a -> apple
</span><span class="go">b -> banana
</span><span class="go">key: a
</span><span class="go">key: b
</span><span class="go">0 103
</span><span class="go">1 111</span></pre>
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</table>
<p class="next">
နောက်ဥပမာ: <a href="functions">Functions</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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