The Atomics.store() static method stores a given value at the given position in the array and returns that value.

Try it

// Create a SharedArrayBuffer with a size in bytes
const buffer = new SharedArrayBuffer(16);
const uint8 = new Uint8Array(buffer);
uint8[0] = 5;

console.log(Atomics.store(uint8, 0, 2));
// Expected output: 2

console.log(Atomics.load(uint8, 0));
// Expected output: 2

Syntax

Atomics.store(typedArray, index, value)

Parameters

typedArray

An integer typed array. One of Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, or BigUint64Array.

index

The position in the typedArray to store a value in.

value

The number to store.

Return value

The value that has been stored.

Exceptions

TypeError

Thrown if typedArray is not one of the allowed integer types.

RangeError

Thrown if index is out of bounds in the typedArray.

Examples

Using store()

const sab = new SharedArrayBuffer(1024);
const ta = new Uint8Array(sab);

Atomics.store(ta, 0, 12); // 12

Specifications

Browser compatibility

See also

• Atomics
• Atomics.load()