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    <p>Current browsers have <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes#Browser_compatibility" rel="noreferrer"><code>Array#includes</code></a>, which does <em>exactly</em> that, <a href="https://kangax.github.io/compat-table/es2016plus/#test-Array.prototype.includes" rel="noreferrer">is widely supported</a>, and has a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes#Polyfill" rel="noreferrer">polyfill</a> for older browsers.</p> <pre><code>&gt; ['joe', 'jane', 'mary'].includes('jane'); true </code></pre> <p>You can also use <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf" rel="noreferrer"><code>Array#indexOf</code></a>, which is less direct, but doesn't require Polyfills for out of date browsers.</p> <p>jQuery offers <a href="http://api.jquery.com/jquery.inarray/" rel="noreferrer"><code>$.inArray</code></a>, which is functionally equivalent to <code>Array#indexOf</code>.</p> <p><a href="http://underscorejs.org/#" rel="noreferrer">underscore.js</a>, a JavaScript utility library, offers <a href="http://underscorejs.org/#contains" rel="noreferrer"><code>_.contains(list, value)</code></a>, alias <code>_.include(list, value)</code>, both of which use <a href="http://underscorejs.org/#indexOf" rel="noreferrer">indexOf</a> internally if passed a JavaScript array.</p> <p>Some other frameworks offer similar methods:</p> <ul> <li>Dojo Toolkit: <a href="http://dojotoolkit.org/reference-guide/dojo/indexOf.html" rel="noreferrer"><code>dojo.indexOf(array, value, [fromIndex, findLast])</code></a></li> <li>Prototype: <a href="http://api.prototypejs.org/language/Array/prototype/indexOf/" rel="noreferrer"><code>array.indexOf(value)</code></a></li> <li>MooTools: <a href="https://mootools.net/core/docs/1.6.0/Types/Array#Array:indexOf" rel="noreferrer"><code>array.indexOf(value)</code></a></li> <li>MochiKit: <a href="http://mochi.github.io/mochikit/doc/html/MochiKit/Base.html#fn-findvalue" rel="noreferrer"><code>findValue(array, value)</code></a></li> <li>MS Ajax: <a href="http://www.asp.net/ajaxlibrary/Reference.Array-indexOf-Function.ashx" rel="noreferrer"><code>array.indexOf(value)</code></a></li> <li>Ext: <a href="http://docs.sencha.com/extjs/4.0.0/#/api/Ext.Array-method-contains" rel="noreferrer"><code>Ext.Array.contains(array, value)</code></a></li> <li>Lodash: <a href="https://lodash.com/docs#includes" rel="noreferrer"><code>_.includes(array, value, [from])</code></a> (is <code>_.contains</code> prior 4.0.0)</li> <li>ECMAScript 2016: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes" rel="noreferrer"><code>array.includes(value)</code></a></li> </ul> <p>Notice that some frameworks implement this as a function, while others add the function to the array prototype.</p>
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    1. POHow do I check if an array includes an object in JavaScript?
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    1. UScodeape
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    1. POHow do I check if an array includes an object in JavaScript?
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    1. COMooTools also has Array.contains that returns a boolean, which sounds like the real question here.
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      1. USRyan Florence
    2. COprototype also has `Array.include` that returns a boolean
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    3. COIf you are using a good browser, you can just use `array.indexOf(object) != -1`
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