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180 lines
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<!DOCTYPE html>
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<meta charset="utf-8">
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<title>Go в примерах: Функции с переменным числом аргументов (Variadic Functions)</title>
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<div class="example" id="variadic-functions">
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<h2><a href="./">Go в примерах</a>: Функции с переменным числом аргументов (Variadic Functions)</h2>
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<table>
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<td class="docs">
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<p><a href="http://en.wikipedia.org/wiki/Variadic_function"><em>Функции с переменным числом аргументов</em></a>
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могут быть вызваны с любым количество аргументов.
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Пример такой функции - это <code>fmt.Println</code>.</p>
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<td class="docs">
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<a href="http://play.golang.org/p/dz6tVXvffuH" target="_blank"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
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<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
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</pre></div>
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<td class="docs">
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<td class="code leading">
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<div class="highlight"><pre><span class="kn">import</span> <span class="s">"fmt"</span>
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</pre></div>
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<td class="docs">
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<p>Это функция, которая может принимать любое количество
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аргументов целых чисел.</p>
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<td class="code leading">
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<div class="highlight"><pre><span class="kd">func</span> <span class="nx">sum</span><span class="p">(</span><span class="nx">nums</span> <span class="o">...</span><span class="kt">int</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Print</span><span class="p">(</span><span class="nx">nums</span><span class="p">,</span> <span class="s">" "</span><span class="p">)</span>
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<span class="nx">total</span> <span class="o">:=</span> <span class="mi">0</span>
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<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>
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<span class="nx">total</span> <span class="o">+=</span> <span class="nx">num</span>
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<span class="p">}</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">total</span><span class="p">)</span>
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<span class="p">}</span>
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</pre></div>
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<td class="docs">
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<td class="code leading">
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<div class="highlight"><pre><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span>
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</pre></div>
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</td>
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<td class="docs">
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<p>Такие функции можно вызывать обычным способом.</p>
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<td class="code leading">
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<div class="highlight"><pre> <span class="nx">sum</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
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<span class="nx">sum</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
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</pre></div>
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<td class="docs">
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<p>Если у вас есть несколько аргументов в срезе,
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вы можете применить его к функции с переменным
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числом аргументов таким образом <code>func(slice...)</code>.</p>
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<td class="code">
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<div class="highlight"><pre> <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">1</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>
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<span class="nx">sum</span><span class="p">(</span><span class="nx">nums</span><span class="o">...</span><span class="p">)</span>
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<span class="p">}</span>
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</pre></div>
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</tr>
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</table>
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<table>
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<td class="docs">
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</td>
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<td class="code leading">
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<div class="highlight"><pre><span class="gp">$</span> go run variadic-functions.go
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<span class="go">[1 2] 3</span>
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<span class="go">[1 2 3] 6</span>
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<span class="go">[1 2 3 4] 10</span>
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</pre></div>
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<tr>
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<td class="docs">
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<p>Другим ключевым аспектом функций в Go являются
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замыкания, которые мы рассмотрим далее.</p>
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</td>
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<td class="code empty">
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</td>
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</table>
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<p class="next">
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Следующий пример: <a href="closures">Замыкания (Closures)</a>.
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</p>
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<p class="footer">
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by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> | <a href="https://github.com/mmcgrana/gobyexample/blob/master/examples/variadic-functions">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
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<br/>
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переведено Nick S. | <a href="https://github.com/badkaktus/gobyexample">исходники</a>
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</p>
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</div>
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<script>
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