Atomics.load()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since December 2021.

The Atomics.load() static method returns a value at a given position in the array.

Try it

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

// 5 + 2 = 7
console.log(Atomics.add(uint8, 0, 2));
// Expected output: 5

console.log(Atomics.load(uint8, 0));
// Expected output: 7

Syntax

Atomics.load(typedArray, index)

Parameters

typedArray: An integer typed array. One of Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, or BigUint64Array.
index: The position in the typedArray to load from.

Return value

The value at the given position (typedArray[index]).

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 `load`

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

Atomics.add(ta, 0, 12);
Atomics.load(ta, 0); // 12

Specifications

Specification
ECMAScript® 2026 Language Specification # sec-atomics.load

Browser compatibility

	Desktop					Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`load`	68	79	78	55	15.2	89	79	63	15.2	15.0	89	1.0	8.10.0