Atomics.or()

Baseline

202112

Atomics.or() OR

//  SharedArrayBuffer 
const buffer = new SharedArrayBuffer(16);
const uint8 = new Uint8Array(buffer);
uint8[0] = 5;

// 5 (0101) OR 2 (0010) = 7 (0111)
console.log(Atomics.or(uint8, 0, 2));
// : 5

console.log(Atomics.load(uint8, 0));
// : 7

Atomics.or(typedArray, index, value)

typedArray: Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, BigUint64Array
index: typedArray OR
value: OR

(typedArray[index])

TypeError: typedArray
RangeError: index typedArray

OR a b 1 1 OR

`a`	`b`	`a \| b`
0	0	0
0	1	1
1	0	1
1	1	1

OR 5 | 1 0101 10 5

or

const sab = new SharedArrayBuffer(1024);
const ta = new Uint8Array(sab);
ta[0] = 2;

Atomics.or(ta, 0, 1); // returns 2, the old value
Atomics.load(ta, 0); // 3


ECMAScript 2027 LanguageSpecification # sec-atomics.or

Atomics
Atomics.and()
Atomics.xor()

MDN

2025725 MDN

GitHub

Atomics