Atomics.exchange()

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.

Syntax

Atomics.exchange(typedArray, index, value)

Parameters

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.

Return value

The old 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

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.exchange()

// 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;

console.log(Atomics.exchange(ta, 0, 12)); // 7, the old value
console.log(Atomics.load(ta, 0)); // 12, the new/current value

Specifications

Browser compatibility

See also

• Atomics
• Atomics.compareExchange()
• Atomics.store()