Baseline Widely available
The Atomics.exchange() static method exchanges 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 between the read of the old value and the write of the new value.
// Create a SharedArrayBuffer with a size in bytes
const buffer = new SharedArrayBuffer(16);
const uint8 = new Uint8Array(buffer);
uint8[0] = 5;
console.log(Atomics.load(uint8, 0));
// Expected output: 5
Atomics.exchange(uint8, 0, 2); // Returns 5
console.log(Atomics.load(uint8, 0));
// Expected output: 2
Atomics.exchange(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 exchange a value.
value
The number to exchange.
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.exchange(ta, 0, 12); // returns 0, the old value
Atomics.load(ta, 0); // 12
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