173 lines
5.8 KiB
Plaintext
Generated
173 lines
5.8 KiB
Plaintext
Generated
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Go Em Exemplos: 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 by Example</a>: 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 tem suporte nativo para <em>múltiplos valores de retorno</em>.
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Esse recurso é utilizado frequentemente
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em Go idiomático, por exemplo, para retornar
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valores de resultado e de erro de uma função.</p>
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</td>
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<td class="code empty leading">
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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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<a target="_blank" href="https://go.dev/play/p/7kvvjKA16K7"><img title="Executar código em nova aba" src="play.png" class="run" /></a><img title="Copiar código" src="clipboard.png" class="copy" />
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<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
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</pre>
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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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<pre class="chroma"><span class="kn">import</span> <span class="s">"fmt"</span>
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</pre>
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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>A expressão <code>(int, int)</code> na assinatura desta função
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demonstra que a função retorna dois inteiros <code>int</code>.</p>
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</td>
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<td class="code leading">
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<pre class="chroma">
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<span class="kd">func</span> <span class="nf">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>
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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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<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
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</pre>
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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>Aqui são utilizados ambos valores retornados
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da função com <em>atribuição múltipla</em>.</p>
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</td>
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<td class="code leading">
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<pre class="chroma">
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<span class="nx">a</span><span class="p">,</span> <span class="nx">b</span> <span class="o">:=</span> <span class="nf">vals</span><span class="p">()</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nf">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="nf">Println</span><span class="p">(</span><span class="nx">b</span><span class="p">)</span>
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</pre>
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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>Para utilizar apenas um dos valores retornados,
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utiliza-se o identificador vazio <code>_</code>.</p>
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</td>
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<td class="code">
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<pre class="chroma">
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<span class="nx">_</span><span class="p">,</span> <span class="nx">c</span> <span class="o">:=</span> <span class="nf">vals</span><span class="p">()</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nf">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>
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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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<pre class="chroma"><span class="gp">$</span> go run multiple-return-values.go
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<span class="go">3
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</span><span class="go">7
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</span><span class="go">7</span></pre>
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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>Aceitar um número variável de argumentos é outro
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ótimo recurso de Go functions; será apresentado
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no próximo exemplo.</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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Próximo exemplo: <a href="variadic-functions">Variadic Functions</a>.
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</p>
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<p class="footer">
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Por <a href="https://markmcgranaghan.com">Mark McGranaghan</a> e <a href="https://eli.thegreenplace.net">Eli Bendersky</a> | traduzido por <a href="https://github.com/lucassauro">Lucassauro</a> | <a href="https://github.com/lucassauro/gobyexample">contribua</a> | <a href="https://github.com/mmcgrana/gobyexample#license">licença</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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codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func vals() (int, int) {\u000A return 3, 7\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' a, b :\u003D vals()\u000A fmt.Println(a)\u000A fmt.Println(b)\u000A');codeLines.push(' _, c :\u003D vals()\u000A fmt.Println(c)\u000A}\u000A');codeLines.push('');codeLines.push('');
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