W3cubDocs

Atomics.and()

The Atomics.and() static method computes a bitwise AND 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

Atomics.and(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 AND.
value: The number to compute the bitwise AND 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 AND operation only yields 1, if both a and b are 1. The truth table for the AND operation is:

`a`	`b`	`a & b`
0	0	0
0	1	0
1	0	0
1	1	1

For example, a bitwise AND of 5 & 1 results in 0001 which is 1 in decimal.

Examples

Using and()

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

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

Specifications

Specification
ECMAScript Language Specification # sec-atomics.and

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
`and`	68	79	78	55	15.2	89	79	63	15.2	15.0	89	1.0	8.10.0