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.
Try it
Syntax
js
Atomics.xor(typedArray, index, value)
Parameters
typedArray-
An integer typed array. One of
Int8Array,Uint8Array,Int16Array,Uint16Array,Int32Array,Uint32Array,BigInt64Array, orBigUint64Array. index-
The position in the
typedArrayto 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
typedArrayis not one of the allowed integer types. RangeError-
Thrown if
indexis out of bounds in thetypedArray.
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.
5 0101 1 0001 ---- 4 0100
Examples
Using xor
js
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
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