Atomics.xor()
The static Atomics.xor()
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.
Syntax
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
-
Throws a
TypeError, iftypedArrayis not one of the allowed integer types. -
Throws a
RangeError, ifindexis 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
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 |
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