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.

Syntax#

Atomics.and(typedArray, index, value)

Parameters#

• typedArray
• : An integer typed array. One of {{jsxref("Int8Array")}}, {{jsxref("Uint8Array")}}, {{jsxref("Int16Array")}}, {{jsxref("Uint16Array")}}, {{jsxref("Int32Array")}}, {{jsxref("Uint32Array")}}, {{jsxref("BigInt64Array")}}, or {{jsxref("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#

• {{jsxref("TypeError")}}
• : Thrown if typedArray is not one of the allowed integer types.
• {{jsxref("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:

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

5  0101
1  0001
   ----
1  0001

Examples#

Note that these examples cannot be run directly from the console or an arbitrary web page, because SharedArrayBuffer is not defined unless its security requirements are met.

Using Atomics.and()#

// Create a SharedArrayBuffer with a size in bytes
const sab = new SharedArrayBuffer(1024);
// Create a view and set the value of the 0 index
const ta = new Uint8Array(sab);
ta[0] = 7;

// 7 (0111) AND 10 (1010) = 2 (0010)
console.log(Atomics.and(ta, 0, 10)); // 7, the old value
console.log(Atomics.load(ta, 0)); // 2, the new/current value

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("Atomics")}}
• {{jsxref("Atomics.or()")}}
• {{jsxref("Atomics.xor()")}}