Web Reference: Description The concat() method concatenates (joins) two or more arrays. The concat() method returns a new array, containing the joined arrays. The concat() method does not change the existing arrays. Jul 10, 2025 · The concat() method of Array instances is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array. In this tutorial, you will learn how to use the JavaScript Array concat () method to merge two or more arrays into a single array.
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