179 lines
6.6 KiB
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179 lines
6.6 KiB
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Generated
<!DOCTYPE html>
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<html>
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<meta charset="utf-8">
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<title>Go в примерах: Функции с множественным возвратом (Multiple Return Values)</title>
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<body>
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<div class="example" id="multiple-return-values">
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<h2><a href="./">Go в примерах</a>: Функции с множественным возвратом (Multiple Return Values)</h2>
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<table>
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<tr>
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<td class="docs">
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<p>Go имеет встроенную поддержку <em>нескольких возвращаемых
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значений</em>. Эта особенность часто применяется в Go,
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например, для возврата результата функции и ошибки.</p>
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<td class="docs">
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</td>
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<td class="code leading">
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<a href="http://play.golang.org/p/6Khmls9Dsin" 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>
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</tr>
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<tr>
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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="kn">import</span> <span class="s">"fmt"</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>Запись <code>(int, int)</code> в описании этой функции, говорит о
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том, что функция возвращает два целых числа.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre><span class="kd">func</span> <span class="nx">vals</span><span class="p">()</span> <span class="p">(</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">return</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">7</span>
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<span class="p">}</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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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="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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</tr>
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<tr>
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<td class="docs">
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<p>Здесь функция возвращает два разных значения и
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присваивает их переменным <code>a,b</code>. Это называется
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<em>множественное присваивание</em>.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre> <span class="nx">a</span><span class="p">,</span> <span class="nx">b</span> <span class="o">:=</span> <span class="nx">vals</span><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">a</span><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">b</span><span class="p">)</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>Если вы хотите получить не все значения, возвращаемые
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функцией, то можно поспользоваться пустым
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идентификатором <code>_</code>.</p>
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</td>
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<td class="code">
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<div class="highlight"><pre> <span class="nx">_</span><span class="p">,</span> <span class="nx">c</span> <span class="o">:=</span> <span class="nx">vals</span><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">c</span><span class="p">)</span>
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<span class="p">}</span>
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</pre></div>
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</td>
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</tr>
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</table>
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<table>
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<tr>
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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 multiple-return-values.go
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<span class="go">3</span>
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<span class="go">7</span>
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<span class="go">7</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>Принятие переменного количества аргументов -
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еще одна приятная особенность функций Go;
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Рассмотрим это дальше.</p>
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</td>
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<td class="code empty">
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</td>
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</tr>
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</table>
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<p class="next">
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Следующий пример: <a href="variadic-functions">Функции с переменным числом аргументов (Variadic Functions)</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/multiple-return-values">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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var codeLines = [];
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