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.

Syntax

Atomics.add(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 add a value to.
• value
  • : The number to add.

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.add()

// 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;

// 7 + 12 = 19
console.log(Atomics.add(ta, 0, 12)); // 7, the old value
console.log(Atomics.load(ta, 0)); // 19, the new/current value

Specifications

Browser compatibility

See also

• Atomics
• sub()