Web Reference: Jul 29, 2025 · It is up to the programmer to know which is the case. Iterables which can iterate only once (such as Generators) customarily return this from their [Symbol.iterator]() method, whereas iterables which can be iterated many times must return a new iterator on each invocation of [Symbol.iterator](). Iterators provide a controlled way to work with data sequences, enabling custom iteration logic for various data structures. In the next chapter you will learn about the new Iterator Helper Functions introduced in ECMAScript 2025. In this tutorial, you will learn about JavaScript iterators and iterables with the help of examples.
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