What are ES6 iterators in JavaScript?

What are ES6 iterators in JavaScript?

ES6 iterators are objects that allow you to traverse through a collection, like arrays or strings, one element at a time.

Can you give me an example of how to use an iterator?

Sure! You can create an iterator using the Symbol.iterator method. Here's a simple example:

const myArray = [1, 2, 3];
const iterator = myArray[Symbol.iterator]();
console.log(iterator.next()); // { value: 1, done: false }
console.log(iterator.next()); // { value: 2, done: false }
console.log(iterator.next()); // { value: 3, done: false }
console.log(iterator.next()); // { value: undefined, done: true }

What does the done property indicate?

The done property indicates whether the iterator has completed iterating through the collection. If it's true, there are no more elements to iterate.

Are there built-in iterators in JavaScript?

Yes, JavaScript has built-in iterators for collections like arrays, strings, maps, and sets, which you can use directly.