From 68fc8e96a9629e73469ed457abd955e548ec670c Mon Sep 17 00:00:00 2001
From: Florian Merz <me@fiji-flo.de>
Date: Thu, 11 Feb 2021 14:49:58 +0100
Subject: unslug pt-br: move

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+---
+title: Array.prototype.includes()
+slug: Web/JavaScript/Reference/Global_Objects/Array/contains
+tags:
+  - Array
+  - ECMAScript7
+  - Experimental
+  - Expérimental(2)
+  - JavaScript
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/includes
+---
+<div>{{JSRef("Global_Objects", "Array")}}</div>
+
+<h2 id="Sumário">Sumário</h2>
+
+<p><span class="seoSummary">O método includes<code>()</code> determina se um array contém um determinado elemento, retornando <code>true</code> ou <code>false</code> apropriadamente.</span></p>
+
+<p><strong style="font-size: 2.14285714285714rem; font-weight: 700; letter-spacing: -1px; line-height: 30px;">Sintaxe</strong></p>
+
+<pre class="syntaxbox"><code><var>array</var>.includes(<var>searchElement</var>[, <var>fromIndex</var>])</code></pre>
+
+<h3 id="Parâmetros">Parâmetros</h3>
+
+<dl>
+ <dt><code>searchElement</code></dt>
+ <dd>O elemento a buscar</dd>
+ <dt><code>fromIndex</code></dt>
+ <dd>Opcional. A posição no array de onde a busca pelo <code>searchElement </code>se iniciará. Por padrão, 0.</dd>
+</dl>
+
+<h2 id="Exemplos">Exemplos</h2>
+
+<pre class="brush: js">[1, 2, 3].includes(2);     // true
+[1, 2, 3].includes(4);     // false
+[1, 2, 3].includes(3, 3);  // false
+[1, 2, 3].includes(3, -1); // true
+[1, 2, NaN].includes(NaN); // true
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<pre class="brush: js">// https://tc39.github.io/ecma262/#sec-array.prototype.includes
+if (!Array.prototype.includes) {
+  Object.defineProperty(Array.prototype, 'includes', {
+    value: function(searchElement, fromIndex) {
+
+      // 1. Let O be ? ToObject(this value).
+      if (this == null) {
+        throw new TypeError('"this" is null or not defined');
+      }
+
+      var o = Object(this);
+
+      // 2. Let len be ? ToLength(? Get(O, "length")).
+      var len = o.length &gt;&gt;&gt; 0;
+
+      // 3. If len is 0, return false.
+      if (len === 0) {
+        return false;
+      }
+
+      // 4. Let n be ? ToInteger(fromIndex).
+      //    (If fromIndex is undefined, this step produces the value 0.)
+      var n = fromIndex | 0;
+
+      // 5. If n ≥ 0, then
+      //  a. Let k be n.
+      // 6. Else n &lt; 0,
+      //  a. Let k be len + n.
+      //  b. If k &lt; 0, let k be 0.
+      var k = Math.max(n &gt;= 0 ? n : len - Math.abs(n), 0);
+
+      // 7. Repeat, while k &lt; len
+      while (k &lt; len) {
+        // a. Let elementK be the result of ? Get(O, ! ToString(k)).
+        // b. If SameValueZero(searchElement, elementK) is true, return true.
+        // c. Increase k by 1.
+        // NOTE: === provides the correct "SameValueZero" comparison needed here.
+        if (o[k] === searchElement) {
+          return true;
+        }
+        k++;
+      }
+
+      // 8. Return false
+      return false;
+    }
+  });
+}
+</pre>
+
+<h2 id="Especificações">Especificações</h2>
+
+<p>Proposta ES7: <a href="https://github.com/domenic/Array.prototype.contains/blob/master/spec.md">https://github.com/domenic/Array.prototype.contains/blob/master/spec.md</a></p>
+
+<h2 id="Compatibilidade">Compatibilidade</h2>
+
+<div>{{Compat("javascript.builtins.Array.includes")}}</div>
+
+<h2 id="Veja_Também">Veja Também</h2>
+
+<ul>
+ <li>{{jsxref("TypedArray.prototype.includes()")}}</li>
+ <li>{{jsxref("String.prototype.includes()")}}</li>
+ <li>{{jsxref("Array.prototype.indexOf()")}}</li>
+</ul>
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