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Typescript includes5/19/2023 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. You can use the includes() method in JavaScript to check if an item exists in an array.
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