Atomics.store()
BaselineWidely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since December 2021.
TheAtomics.store() staticmethod stores a given value at the given position in the array and returns that value.
Try it
// Create a SharedArrayBuffer with a size in bytesconst buffer = new SharedArrayBuffer(16);const uint8 = new Uint8Array(buffer);uint8[0] = 5;console.log(Atomics.store(uint8, 0, 2));// Expected output: 2console.log(Atomics.load(uint8, 0));// Expected output: 2Syntax
js
Atomics.store(typedArray, index, value)Parameters
typedArrayAn integer typed array. One of
Int8Array,Uint8Array,Int16Array,Uint16Array,Int32Array,Uint32Array,BigInt64Array, orBigUint64Array.indexThe position in the
typedArrayto store avaluein.valueThe number to store.
Return value
The value that has been stored.
Exceptions
TypeErrorThrown if
typedArrayis not one of the allowed integer types.RangeErrorThrown if
indexis out of bounds in thetypedArray.
Examples
Using store()
js
const sab = new SharedArrayBuffer(1024);const ta = new Uint8Array(sab);Atomics.store(ta, 0, 12); // 12Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-atomics.store |