Iterator.prototype.toArray()

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The toArray() method of Iterator instances creates a new Array instance populated with the elements yielded from the iterator.

Syntax

toArray()

Parameters

None.

Return value

A new Array instance containing the elements from the iterator in the order they were produced.

Examples

Using toArray()

iterator.toArray() is equivalent to Array.from(iterator) and [...iterator], except that it's easier to chain when multiple iterator helper methods are involved. The following example creates an iterator that yields terms in the Fibonacci sequence, takes the first 10 terms, filters out the odd numbers, and converts the result to an array:

function* fibonacci() {
  let current = 1;
  let next = 1;
  while (true) {
    yield current;
    [current, next] = [next, current + next];
  }
}

const array = fibonacci()
  .take(10)
  .filter((x) => x % 2 === 0)
  .toArray();

console.log(array); // [2, 8, 34]

Note that it's a good idea to call toArray() as a last step of your processing. For example, fibonacci().take(10).toArray().filter(...) is less efficient, because iterator helpers are lazy and avoids creating a temporary array.

Specifications

Specification
Iterator Helpers # sec-iteratorprototype.toarray

Browser compatibility

	Desktop					Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`toArray`	122117–119	122117–119	131	108103–105	No	122117–119	131	8178–79	No	26.024.0–25.0	122117–119	1.42	22.0.0