`Array.from()`

Creates a new array from an iterable or array-like object, with an optional map function.

Since ES2015 Spec ↗

Syntax

Array.from(arrayLike, mapFn, thisArg)

Name	Type	Required	Description
`arrayLike`	`object`	Yes	An iterable (e.g. Set, Map, string) or array-like object with a length property.
`mapFn`	`Function`	No	Map function called on every element with (element, index).
`thisArg`	`any`	No	Value to use as `this` when executing mapFn.

Array — A new Array instance.

console.log(Array.from('abc'));

Output

[ 'a', 'b', 'c' ]

console.log(Array.from({ length: 3 }, (_, i) => i * 2));

Output

[ 0, 2, 4 ]

Works with any iterable (Set, Map, generators) or array-like object. The mapFn avoids creating an intermediate array compared to `.map()` afterward.