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. 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. Jan 19, 2026 · The concat () method is used to join two or more arrays together. It creates a new array that contains all the combined elements. Combines multiple arrays into one new array. Does not change the original arrays. Useful for merging arrays safely.
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