Here's the syntax for using the includes() method to check if an item is in an array: array.includes(item, fromIndex)Īrray denotes the name of the array which will be searched through to check if an item exists. How to Check if an Item is in an Array in JavaScript Using Array.includes() In this article, you'll see how to use the includes() method in JavaScript to check if an item is in an Array, and if a substring exists within a string. It returns true if the item is found in the array/string and false if the item doesn't exist. You can also use it to check if a substring exists within a string. Now we will use a couple of examples to show how the includes() method actually works.You can use the includes() method in JavaScript to check if an item exists in an array. How to search an element/item in an array using includes method (JavaScript) Use Option + ⌘ + C keyboard shortcut keys in Safari (if the developer menu does not appear, open Preferences by pressing ⌘ +, and in the Advanced tab, check “Show Develop menu in menu bar”).Use CTRL + SHIFT + K keyboard shortcut keys for Mozilla.Use the F12 key in Chrome and other chromium-based browsers.Note: We will use the browser console to demonstrate examples performed in this post. Since this article is about JavaScript, we will only use includes() in our article from here on. The includes() and contains() both have the same functionality, but in JavaScript, this functionality is termed as includes(), while in other programming languages such as Java, it is called contains(). It is used in other languages such as Java. The includes() is a method present in JavaScript, whereas contains() is not present in JavaScript. The includes and contains both methods search for a substring within a string or find elements within an array. It is 0 by default.ĭifference between includes() and contains() It gives the index at which to start the search. starting_point: This parameter is optional.It is the element that needs to be searched within the array. element: The first parameter is required.The include() method takes two parameters in JavaScript:
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