Web Reference: Jun 15, 2017 · push pushes arrays as one item, concat concats arrays, or an array with an item, beside the different return types. The push() adds elements to the end of an array and returns the new length of the array. Thus your return here is invalid. The concat() method is used to merge 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. 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.
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