Web Reference: Jul 10, 2025 · The join() method of Array instances creates and returns a new string by concatenating all of the elements in this array, separated by commas or a specified separator string. If the array has only one item, then that item will be returned without using the separator. Decoding javascript arrays. Explaining a few ways to use array.join() Description The join() method returns an array as a string. The join() method does not change the original array. Any separator can be specified. The default is comma (,).
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