Web Reference: 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. 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. 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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