files/en-us/web/javascript/reference/global_objects/atomics/load/index.md

metadata

title: Atomics.load()
short-title: load()
slug: Web/JavaScript/Reference/Global_Objects/Atomics/load
page-type: javascript-static-method
browser-compat: javascript.builtins.Atomics.load
sidebar: jsref

The Atomics.load() static method returns a value at a given position in the array.

{{InteractiveExample("JavaScript Demo: Atomics.load()")}}

// Create a SharedArrayBuffer with a size in bytes
const buffer = new SharedArrayBuffer(16);
const uint8 = new Uint8Array(buffer);
uint8[0] = 5;

// 5 + 2 = 7
console.log(Atomics.add(uint8, 0, 2));
// Expected output: 5

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

Syntax

Atomics.load(typedArray, index)

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 load from.

Return value

The 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.

Examples

Using load

const sab = new SharedArrayBuffer(1024);
const ta = new Uint8Array(sab);

Atomics.add(ta, 0, 12);
Atomics.load(ta, 0); // 12

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{jsxref("Atomics")}}
• {{jsxref("Atomics.store()")}}