Atomics.xor() - JavaScript 编辑

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.

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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

• Throws a TypeError, if typedArray is not one of the allowed integer types.
• Throws a RangeError, 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:

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

Browser compatibility

BCD tables only load in the browser

See also

• Atomics
• Atomics.and()
• Atomics.or()