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. The JavaScript Array.concat () method is used to join or concatenate two or more arrays. After joining, this method will not change the existing arrays that we want to join; instead, it returns a new array as a result containing the joined arrays.
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