TypedArray.prototype.set()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The set() method of TypedArray instances stores multiple values in the typed
array, reading input values from a specified array.
Try it
// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(8);
const uint8 = new Uint8Array(buffer);
// Copy the values into the array starting at index 3
uint8.set([1, 2, 3], 3);
console.log(uint8);
// Expected output: Uint8Array [0, 0, 0, 1, 2, 3, 0, 0]
Syntax
set(array)
set(array, targetOffset)
set(typedarray)
set(typedarray, targetOffset)
Parameters
array-
The array from which to copy values. All values from the source array are copied into the target array, unless the length of the source array plus the target offset exceeds the length of the target array, in which case an exception is thrown.
typedarray-
If the source array is a typed array, the two arrays may share the same underlying
ArrayBuffer; the JavaScript engine will intelligently copy the source range of the buffer to the destination range. targetOffsetOptional-
The offset into the target array at which to begin writing values from the source array. If this value is omitted, 0 is assumed (that is, the source array will overwrite values in the target array starting at index 0).
Return value
None (undefined).
Exceptions
RangeError-
Thrown in one of the following cases:
- An element will be stored beyond the end of the typed array, either because
targetOffsetis too large or becausearrayortypedarrayis too large. targetOffsetis negative.
- An element will be stored beyond the end of the typed array, either because
Examples
Using set()
const buffer = new ArrayBuffer(8);
const uint8 = new Uint8Array(buffer);
uint8.set([1, 2, 3], 3);
console.log(uint8); // Uint8Array [ 0, 0, 0, 1, 2, 3, 0, 0 ]
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-%typedarray%.prototype.set |