Web Reference: Jul 29, 2025 · Iterators In JavaScript an iterator is an object which defines a sequence and potentially a return value upon its termination. Specifically, an iterator is any object which implements the Iterator protocol by having a next() method that returns an object with two properties: value The next value in the iteration sequence. done This is true if the last value in the sequence has already been ... In this tutorial, you will learn about JavaScript iterators and iterables with the help of examples. Technically, iterables must implement the Symbol.iterator method. In JavaScript the following are iterables: Strings Arrays Typed Arrays Sets Maps Because their prototype objects have a Symbol.iterator method: Iterators provide a controlled way to work with data sequences, enabling custom iteration logic for various data structures.
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