From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:42:52 -0500
Subject: initial commit

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+---
+title: Array.prototype.flat()
+slug: Web/JavaScript/Reference/Global_Objects/Array/flat
+tags:
+  - Array
+  - Experimental
+  - JavaScript
+  - Method
+  - Prototype
+  - flat
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/flat
+---
+<div>{{JSRef}} {{SeeCompatTable}}</div>
+
+<p>O método <code><strong>flat()</strong></code> cria um novo array com todos elementos sub-arrays concatenados nele de forma recursiva até a profundidade<em> </em>especificada.</p>
+
+<p class="hidden">\{{EmbedInteractiveExample("pages/js/array-flatten.html")}}</p>
+
+
+
+<h2 id="Sintaxe">Sintaxe</h2>
+
+<pre class="syntaxbox notranslate"><var>var novoArray = arr</var>.flat(<var>depth</var>)</pre>
+
+<h3 id="Parâmetros">Parâmetros</h3>
+
+<dl>
+ <dt><code>depth</code> {{optional_inline}}</dt>
+ <dd>O nível de profundidade especifíca o quanto um array aninhando deve ser achatado. O Default é 1.</dd>
+</dl>
+
+<h3 id="Retorno">Retorno</h3>
+
+<p>Um novo array com os elementos sub-array concatenados nele.</p>
+
+<h2 id="Exemplos">Exemplos</h2>
+
+<h3 id="Achatando_arrays_aninhados">Achatando arrays aninhados</h3>
+
+<pre class="brush: js notranslate">var arr1 = [1, 2, [3, 4]];
+arr1.flat();
+// [1, 2, 3, 4]
+
+var arr2 = [1, 2, [3, 4, [5, 6]]];
+arr2.flat();
+// [1, 2, 3, 4, [5, 6]]
+
+var arr3 = [1, 2, [3, 4, [5, 6]]];
+arr3.flat(2);
+// [1, 2, 3, 4, 5, 6]
+
+<code>const arr4 = [1, 2, [3, 4, [5, 6, [7, 8]]]];
+arr4.flat(Infinity);
+// [1, 2, 3, 4, 5, 6, 7, 8]</code></pre>
+
+<h3 id="Achatando_e_buracos_em_array">Achatando e buracos em array</h3>
+
+<p>o método flat remove espaços vazios do array:</p>
+
+<pre class="brush: js notranslate">var arr4 = [1, 2, , 4, 5];
+arr4.flat();
+// [1, 2, 4, 5]</pre>
+
+<div class="line"></div>
+
+<h2 id="Alternativa">Alternativa</h2>
+
+<h3 id="reduce_e_concat"><code>reduce</code> e <code>concat</code></h3>
+
+<pre class="brush: js notranslate">var arr1 = [1, 2, [3, 4]];
+arr1.flat();
+
+//achatar array de nível único
+arr1.reduce((acc, val) =&gt; acc.concat(val), []);
+// [1, 2, 3, 4]
+
+//para achatamentos mais profundos, use recursividade com reduce e concat
+var arr1 = [1,2,3,[1,2,3,4, [2,3,4]]];
+
+(function flattenDeep(arr1){
+   return arr1.reduce((acc, val) =&gt; Array.isArray(val) ? acc.concat(flattenDeep(val)) : acc.concat(val), []);
+})(arr1);
+
+// [1, 2, 3, 1, 2, 3, 4, 2, 3, 4]
+
+
+</pre>
+
+<h2 id="Especificações">Especificações</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Especificação</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comentários</th>
+  </tr>
+  <tr>
+   <td><a href="https://tc39.github.io/proposal-flatMap/#sec-Array.prototype.flat"><code>Array.prototype.flat</code> proposal</a></td>
+   <td>Draft</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilidade_em_Navegadores">Compatibilidade em Navegadores</h2>
+
+<div>
+
+
+<p>{{Compat("javascript.builtins.Array.flat")}}</p>
+</div>
+
+<h2 id="Veja_Também">Veja Também</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.flatMap()")}}</li>
+ <li>{{jsxref("Array.prototype.map()")}}</li>
+ <li>{{jsxref("Array.prototype.reduce()")}}</li>
+ <li>{{jsxref("Array.prototype.concat()")}}</li>
+</ul>
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