Baseline Widely available
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.
// Create a SharedArrayBuffer with a size in bytes
const buffer = new SharedArrayBuffer(16);
const uint8 = new Uint8Array(buffer);
uint8[0] = 7;
// 7 + 2 = 9
console.log(Atomics.add(uint8, 0, 2));
// Expected output: 7
console.log(Atomics.load(uint8, 0));
// Expected output: 9
Atomics.add(typedArray, index, value)
typedArray
An integer typed array. One of Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, or BigUint64Array.
index
The position in the typedArray to add a value to.
value
The number to add.
The old value at the given position (typedArray[index]).
TypeError
Thrown if typedArray is not one of the allowed integer types.
RangeError
Thrown if index is out of bounds in the typedArray.
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
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