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What are iterators in JavaScript?

Asked on Jul 15, 2025

Answer

Iterators in JavaScript are objects that allow you to traverse through a collection, such as an array or a string, one element at a time. They provide a standardized way to access elements sequentially without exposing the underlying structure.

// Example of using an iterator with an array
        const array = ['a', 'b', 'c'];
        const iterator = array[Symbol.iterator]();

        console.log(iterator.next()); // { value: 'a', done: false }
        console.log(iterator.next()); // { value: 'b', done: false }
        console.log(iterator.next()); // { value: 'c', done: false }
        console.log(iterator.next()); // { value: undefined, done: true }

Additional Comment:

An iterator object implements the "next" method, which returns an object with two properties: "value" (the current element) and "done" (a boolean indicating if the iteration is complete).
The "Symbol.iterator" is a built-in symbol that specifies the default iterator for an object.
Iterators are commonly used in loops, such as "for...of", to iterate over iterable objects.

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Ask any question about JavaScript here... and get an instant response.

What are iterators in JavaScript?

Asked on Jul 15, 2025

Answer

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