Atomics.add()
The Atomics.add() static
method adds a given value at a given position in the array and returns the old value at
that position. This atomic operation guarantees that no other write happens until the
modified value is written back.
Try it
Syntax
js
Atomics.add(typedArray, index, value)
Parameters
typedArray-
An integer typed array. One of
Int8Array,Uint8Array,Int16Array,Uint16Array,Int32Array,Uint32Array,BigInt64Array, orBigUint64Array. index-
The position in the
typedArrayto add avalueto. value-
The number to add.
Return value
The old 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
Using add()
js
const sab = new SharedArrayBuffer(1024);
const ta = new Uint8Array(sab);
Atomics.add(ta, 0, 12); // returns 0, the old value
Atomics.load(ta, 0); // 12
Specifications
| Specification |
|---|
| ECMAScript Language Specification # sec-atomics.add |
Browser compatibility
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