This method searches the array for the given value and returns its index.

The simplest and fastest way to check if an item is present in an array is by using the Array.indexOf() method. The includes() method doesn't work in IE and is only available in modern browsers. includes ( 29n ) // true // Symbolīoth includes() and indexOf() behave differently with NaN ('Not-a-Number') property: const arr = // ✅ includes ( undefined ) // true // boolean includes ( '🍐', 4 ) // trueīeside strings, the includes() method also works great with other primitive types: const symbol = Symbol ( '🌟' ) const types = // strings But you can also pass in a starting index as a second parameter to start the search from a different position: fruits. The includes() method is perfect for finding whether the element exists or not as a simple boolean value: const fruits = īy default, the includes() method searches the entire array. This method returns true if the element exists in the array and false if not. The includes method was added in ES6 to determine whether an array contains a specified value. to check whether the given value or element exists in an array or not. Apart from loops, you can use includes(), indexOf(), find(), etc. In JavaScript, there are multiple ways to check if an array includes an item.

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