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.
TypedArray.prototype.copyWithin()
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Syntax
copyWithin(target, start) copyWithin(target, start, end)
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.
Examples
Using copyWithin
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
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
copyWithin |
45
|
14
|
34
|
No
|
36
|
9.1
|
No
|
No
|
34
|
No
|
9.3
|
No
|
1.0
|
4.0.0
|
See also
© 2005–2022 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/copyWithin