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. This atomic operation guarantees that the read is tear-free, and that all atomic reads are sequentially consistent.
Syntax
Atomics.load(typedArray, index)
Parameters
typedArray-
An integer typed array. One of
Int8Array,Uint8Array,Int16Array,Uint16Array,Int32Array,Uint32Array,BigInt64Array, orBigUint64Array. index-
The position in the
typedArrayto load from.
Return value
The value at the given position (typedArray[index]).
Exceptions
TypeError-
Thrown if
typedArrayis not one of the allowed integer types. RangeError-
Thrown if
indexis out of bounds in thetypedArray.
Examples
Note that these examples cannot be run directly from the console or an arbitrary web page, because SharedArrayBuffer is not defined unless its security requirements are met.
Using Atomics.load()
// Create a SharedArrayBuffer with a size in bytes
const sab = new SharedArrayBuffer(1024);
// Create a view and set the value of the 0 index
const ta = new Uint8Array(sab);
ta[0] = 7;
Atomics.add(ta, 0, 12); // Add 12 to index 0
console.log(Atomics.load(ta, 0)); // 19, the new/current value
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-atomics.load |