201 lines
9.0 KiB
Plaintext
Generated
201 lines
9.0 KiB
Plaintext
Generated
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<title>Go Em Exemplos: Arrays</title>
|
|
<link rel=stylesheet href="site.css">
|
|
</head>
|
|
<script>
|
|
onkeydown = (e) => {
|
|
|
|
if (e.key == "ArrowLeft") {
|
|
window.location.href = 'switch';
|
|
}
|
|
|
|
|
|
if (e.key == "ArrowRight") {
|
|
window.location.href = 'slices';
|
|
}
|
|
|
|
}
|
|
</script>
|
|
<body>
|
|
<div class="example" id="arrays">
|
|
<h2><a href="./">Go by Example</a>: Arrays</h2>
|
|
|
|
<table>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
<p>Em Go, um <em>array</em> é uma sequência numerada de elementos
|
|
de um tamanho específico. Tipicamente, <a href="slices">slices</a> são
|
|
muito mais comuns; arrays são úteis em alguns cenários
|
|
específicos.</p>
|
|
|
|
</td>
|
|
<td class="code empty leading">
|
|
|
|
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
|
|
</td>
|
|
<td class="code leading">
|
|
<a target="_blank" href="https://go.dev/play/p/6x5yvAy8AT6"><img title="Executar código em nova aba" src="play.png" class="run" /></a><img title="Copiar código" src="clipboard.png" class="copy" />
|
|
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
|
|
</pre>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
|
|
</td>
|
|
<td class="code leading">
|
|
|
|
<pre class="chroma"><span class="kn">import</span> <span class="s">"fmt"</span>
|
|
</pre>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
|
|
</td>
|
|
<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>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
<p>Aqui é criado um array <code>a</code> com capacidade de armazenar
|
|
exatamente 5 inteiros. O tipo de elemento que ele irá
|
|
armazenar (int) e seu tamanho (5) são partes do tipo do array.
|
|
Neste caso, o array tem valores padrão zero.</p>
|
|
|
|
</td>
|
|
<td class="code leading">
|
|
|
|
<pre class="chroma">
|
|
<span class="kd">var</span> <span class="nx">a</span> <span class="p">[</span><span class="mi">5</span><span class="p">]</span><span class="kt">int</span>
|
|
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"vazio:"</span><span class="p">,</span> <span class="nx">a</span><span class="p">)</span>
|
|
</pre>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
<p>É possível alterar o valor de um índice do array
|
|
utilizando a sintaxe <code>array[índice] = valor</code>,
|
|
bem como selecionar um valor com <code>array[índice]</code>.</p>
|
|
|
|
</td>
|
|
<td class="code leading">
|
|
|
|
<pre class="chroma">
|
|
<span class="nx">a</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span> <span class="p">=</span> <span class="mi">100</span>
|
|
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"índice 4 alterado:"</span><span class="p">,</span> <span class="nx">a</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">"valor índice 4:"</span><span class="p">,</span> <span class="nx">a</span><span class="p">[</span><span class="mi">4</span><span class="p">])</span>
|
|
</pre>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
<p>A função nativa <code>len</code> retorna o tamanho de um array.</p>
|
|
|
|
</td>
|
|
<td class="code leading">
|
|
|
|
<pre class="chroma">
|
|
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"len:"</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="nx">a</span><span class="p">))</span>
|
|
</pre>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
<p>Para declarar a inicializar um array em uma linha,
|
|
é possível usar esta sintaxe.</p>
|
|
|
|
</td>
|
|
<td class="code leading">
|
|
|
|
<pre class="chroma">
|
|
<span class="nx">b</span> <span class="o">:=</span> <span class="p">[</span><span class="mi">5</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> <span class="mi">5</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">"array inicializado:"</span><span class="p">,</span> <span class="nx">b</span><span class="p">)</span>
|
|
</pre>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
<p>Arrays, via de regra são unidimensionais, mas é possível
|
|
compor tipos para formar arrays multidimensionais.</p>
|
|
|
|
</td>
|
|
<td class="code">
|
|
|
|
<pre class="chroma">
|
|
<span class="kd">var</span> <span class="nx">twoD</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="kt">int</span>
|
|
<span class="k">for</span> <span class="nx">i</span> <span class="o">:=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="p"><</span> <span class="mi">2</span><span class="p">;</span> <span class="nx">i</span><span class="o">++</span> <span class="p">{</span>
|
|
<span class="k">for</span> <span class="nx">j</span> <span class="o">:=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">j</span> <span class="p"><</span> <span class="mi">3</span><span class="p">;</span> <span class="nx">j</span><span class="o">++</span> <span class="p">{</span>
|
|
<span class="nx">twoD</span><span class="p">[</span><span class="nx">i</span><span class="p">][</span><span class="nx">j</span><span class="p">]</span> <span class="p">=</span> <span class="nx">i</span> <span class="o">+</span> <span class="nx">j</span>
|
|
<span class="p">}</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">"bi-dimensional: "</span><span class="p">,</span> <span class="nx">twoD</span><span class="p">)</span>
|
|
<span class="p">}</span>
|
|
</pre>
|
|
</td>
|
|
</tr>
|
|
|
|
</table>
|
|
|
|
<table>
|
|
|
|
<tr>
|
|
<td class="docs">
|
|
<p>Note que arrays aparecem na forma <code>[v1 v2 v3 ...]</code>
|
|
quando exibidos com <code>fmt.Println</code>.</p>
|
|
|
|
</td>
|
|
<td class="code">
|
|
|
|
<pre class="chroma">
|
|
<span class="gp">$</span> go run arrays.go
|
|
<span class="go">vazio: [0 0 0 0 0]
|
|
</span><span class="go">índice 4 alterado: [0 0 0 0 100]
|
|
</span><span class="go">valor índice 4: 100
|
|
</span><span class="go">len: 5
|
|
</span><span class="go">array inicializado:: [1 2 3 4 5]
|
|
</span><span class="go">bi-dimensional: [[0 1 2] [1 2 3]]</span></pre>
|
|
</td>
|
|
</tr>
|
|
|
|
</table>
|
|
|
|
|
|
<p class="next">
|
|
Próximo exemplo: <a href="slices">Slices</a>.
|
|
</p>
|
|
|
|
|
|
<p class="footer">
|
|
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>
|
|
</p>
|
|
|
|
</div>
|
|
<script>
|
|
var codeLines = [];
|
|
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' var a [5]int\u000A fmt.Println(\"vazio:\", a)\u000A');codeLines.push(' a[4] \u003D 100\u000A fmt.Println(\"índice 4 alterado:\", a)\u000A fmt.Println(\"valor índice 4:\", a[4])\u000A');codeLines.push(' fmt.Println(\"len:\", len(a))\u000A');codeLines.push(' b :\u003D [5]int{1, 2, 3, 4, 5}\u000A fmt.Println(\"array inicializado:\", b)\u000A');codeLines.push(' var twoD [2][3]int\u000A for i :\u003D 0; i \u003C 2; i++ {\u000A for j :\u003D 0; j \u003C 3; j++ {\u000A twoD[i][j] \u003D i + j\u000A }\u000A }\u000A fmt.Println(\"bi-dimensional: \", twoD)\u000A}\u000A');codeLines.push('');
|
|
</script>
|
|
<script src="site.js" async></script>
|
|
</body>
|
|
</html>
|