Synchronous iteration was introduced in ES6 and it works with below set of components,
Iterable: It is an object which can be iterated over via a method whose key is Symbol.iterator. Iterator: It is an object returned by invoking [Symbol.iterator]() on an iterable.
This iterator object wraps each iterated element in an object and returns it via next() method one by one. IteratorResult: It is an object returned by next() method. The object contains two properties; the value property contains an iterated element and the done property determines whether the element is the last element or not.
Let’s demonstrate synchronous iteration with an array as below,
1 2 3 4 5 6 | const iterable = ['one', 'two', 'three']; const iterator = iterable[Symbol.iterator](); console.log(iterator.next()); // { value: 'one', done: false } console.log(iterator.next()); // { value: 'two', done: false } console.log(iterator.next()); // { value: 'three', done: false } console.log(iterator.next()); // { value: 'undefined, done: true } |
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