Source @ github

Array.copyWithin

copyWithin — Copies a subset of the array and pastes over the array's current values starting at target.

Description

Array.copyWithin(integer target, integer start, [integer end])

Parameters

Name Description Type Default Optional
target integer No
start integer No
end integer Yes

Return values

The array with the filled values.

Changelog

Version Description
ES 6 Introduced.

Examples

Example #1 – copyWithin example

The array is overwritten when filling.

var array = [2, 4, 8, 4, 16, 4, 32];
console.log(array.copyWithin(1, 1));        // [2, 4, 8, 4, 16, 4, 32]
console.log(array);                         // [2, 4, 8, 4, 16, 4, 32]

array = [2, 4, 8, 4, 16, 4, 32];
console.log(array.copyWithin(1, 3, 5));     // [2, 4, 16, 4, 16, 4, 32]
console.log(array);                         // [2, 4, 16, 4, 16, 4, 32]

array = [2, 4, 8, 4, 16, 4, 32];
console.log(array.copyWithin(0, 1, 5));     // [4, 8, 4, 16, 16, 4, 32]
console.log(array);                         // [4, 8, 4, 16, 16, 4, 32]

External references