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Atomics.xor()

The Atomics.xor() static method computes a bitwise XOR with 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.

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Syntax

Atomics.xor(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 compute the bitwise XOR.
value: The number to compute the bitwise XOR with.

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.

Description

The bitwise XOR operation yields 1, if a and b are different. The truth table for the XOR operation is:

`a`	`b`	`a ^ b`
0	0	0
0	1	1
1	0	1
1	1	0

For example, a bitwise XOR of 5 ^ 1 results in 0100 which is 4 in decimal.

Examples

Using xor

const sab = new SharedArrayBuffer(1024);
const ta = new Uint8Array(sab);
ta[0] = 5;

Atomics.xor(ta, 0, 1); // returns 5, the old value
Atomics.load(ta, 0); // 4

Specifications

Specification
ECMAScript Language Specification # sec-atomics.xor

Browser compatibility

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`xor`	68	79	78	55	15.2	89	79	63	15.2	15.0	89	1.0	8.10.0