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196 lines
7.0 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: Functions</title>
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<link rel=stylesheet href="site.css">
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</head>
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<script>
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onkeydown = (e) => {
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if (e.key == "ArrowLeft") {
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window.location.href = 'range';
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window.location.href = 'multiple-return-values';
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<body>
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<div class="example" id="functions">
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<h2><a href="./">Go by Example</a>: Functions</h2>
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<table>
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<tr>
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<td class="docs">
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<p><em>Functions</em> são centrais em Go. Serão demonstradas
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funções com alguns exemplos diferentes.</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/D8sGhZBD4Ai"><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>Aqui está uma função que recebe dois inteiros <code>int</code> e retorna a soma de ambos como outro inteiro <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">plus</span><span class="p">(</span><span class="nx">a</span> <span class="kt">int</span><span class="p">,</span> <span class="nx">b</span> <span class="kt">int</span><span class="p">)</span> <span class="kt">int</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>Go exige retornos explícitos. Por exemplo,
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não será retornado automaticamente o valor
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da última expressão</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="k">return</span> <span class="nx">a</span> <span class="o">+</span> <span class="nx">b</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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<p>Ao existir multiplos parâmetros consecutivos de um
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mesmo tipo, é possível omitir o tipo dos parâmetros
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até a declaração do último parâmetro daquele tipo.</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">plusPlus</span><span class="p">(</span><span class="nx">a</span><span class="p">,</span> <span class="nx">b</span><span class="p">,</span> <span class="nx">c</span> <span class="kt">int</span><span class="p">)</span> <span class="kt">int</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nx">a</span> <span class="o">+</span> <span class="nx">b</span> <span class="o">+</span> <span class="nx">c</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>Para executar uma função é utilizada a
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sintaxe <code>nomeDaFuncao(argumentos)</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="nx">res</span> <span class="o">:=</span> <span class="nf">plus</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">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"1+2 ="</span><span class="p">,</span> <span class="nx">res</span><span class="p">)</span>
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</pre>
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</td>
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</tr>
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<td class="docs">
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</td>
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<td class="code">
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<pre class="chroma"> <span class="nx">res</span> <span class="p">=</span> <span class="nf">plusPlus</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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<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"1+2+3 ="</span><span class="p">,</span> <span class="nx">res</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 functions.go
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<span class="go">1+2 = 3
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</span><span class="go">1+2+3 = 6</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>Existem muitos outros recursos em Funções,
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um dos quais é chamado de Retorno de Valores
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Múltiplos que será apresentado 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="multiple-return-values">Multiple Return Values</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 plus(a int, b int) int {\u000A');codeLines.push(' return a + b\u000A}\u000A');codeLines.push('func plusPlus(a, b, c int) int {\u000A return a + b + c\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' res :\u003D plus(1, 2)\u000A fmt.Println(\"1+2 \u003D\", res)\u000A');codeLines.push(' res \u003D plusPlus(1, 2, 3)\u000A fmt.Println(\"1+2+3 \u003D\", res)\u000A}\u000A');codeLines.push('');codeLines.push('');
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