TypedArray.prototype.copyWithin()

The copyWithin() method copies the sequence of array elements within the array to the position starting at target. The copy is taken from the index positions of the second and third arguments start and end. The end argument is optional and defaults to the length of the array. This method has the same algorithm as Array.prototype.copyWithin. TypedArray is one of the typed array types here.

Syntax

typedarray.copyWithin(target, start[, end = this.length])

Parameters

target
Target start index position where to copy the elements to.
start
Source start index position where to start copying elements from.
end Optional
Optional. Source end index position where to end copying elements from.

Return value

The modified array.

Description

See Array.prototype.copyWithin for more details.

This method replaces the experimental TypedArray.prototype.move().

Examples

var buffer = new ArrayBuffer(8);
var uint8 = new Uint8Array(buffer);
uint8.set([1,2,3]);
console.log(uint8); // Uint8Array [ 1, 2, 3, 0, 0, 0, 0, 0 ]
uint8.copyWithin(3,0,3);
console.log(uint8); // Uint8Array [ 1, 2, 3, 1, 2, 3, 0, 0 ]

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'TypedArray.prototype.copyWithin' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'TypedArray.prototype.copyWithin' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support 45Edge Full support 14Firefox Full support 34IE No support NoOpera Full support 36Safari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile ? Firefox Android Full support 34Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support Nonodejs Full support 4.0.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

Contributors to this page: wbamberg, fscholz, eduardoboucas, halfbyte
Last updated by: wbamberg,