Array.prototype.includes () - JavaScript | MDN
Jul 20, 2025 · The includes () method of Array instances determines whether an array includes a certain value among its entries, returning true or false as appropriate.
JavaScript Array includes () Method - W3Schools
Description The includes() method returns true if an array contains a specified value. The includes() method returns false if the value is not found. The includes() method is case sensitive.
How do I check if an array includes a value in JavaScript?
Modern browsers have Array#includes, which does exactly that and is widely supported by everyone except IE: You can also use Array#indexOf, which is less direct, but doesn't require …
JavaScript Array includes () Method
This tutorial shows you how to use the JavaScript Array includes () method to check if an array contains a specified element.
JavaScript Array includes () Method - GeeksforGeeks
Jul 11, 2025 · The includes () method in JavaScript returns true if an array contains a specified value, and false if the value is not found. This method simplifies checking for the presence of …
JavaScript Array includes (): Check If an Array Contains
Aug 28, 2025 · The JavaScript Array includes () method checks whether an array contains a specified value (either a primitive or a reference type) among its elements. It returns a boolean …
JavaScript Array Contains: 6 Methods to Find a Value | Built In
Jun 12, 2025 · Learn how to discover what a JavaScript Array contains using indexOf, includes, for loop, some methods and more. Summary: JavaScript offers multiple methods to check if an …
Understanding `Array.includes ()` in JavaScript - DEV Community
Jun 12, 2025 · But includes() uses the SameValueZero algorithm, which treats NaN as equal to NaN. Here’s a simplified version of how SameValueZero works: Important note: +0 and -0 are …
JavaScript Array includes () Method: Checking Array Inclusion
Feb 5, 2025 · A comprehensive guide to the JavaScript Array includes () method, demonstrating how to efficiently check if an array contains a specific element.
JavaScript Array Includes: How to Check for Specific Values
Mar 28, 2025 · JavaScript provides multiple ways to check for the presence of a value in an array, with the includes() method being one of the simplest and most efficient. In this blog, we will …