BigUint64Array() constructor

Baseline Widely available

This feature is well established and works across many devices and browser versions. It's been available across browsers since September 2021.

The BigUint64Array() constructor creates BigUint64Array objects. The contents are initialized to 0n unless initialization data is explicitly provided.

Syntax

new BigUint64Array()
new BigUint64Array(length)
new BigUint64Array(typedArray)
new BigUint64Array(object)

new BigUint64Array(buffer)
new BigUint64Array(buffer, byteOffset)
new BigUint64Array(buffer, byteOffset, length)

Note: BigUint64Array() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

See TypedArray.

Exceptions

See TypedArray.

Examples

Different ways to create a BigUint64Array

// From a length
const biguint64 = new BigUint64Array(2);
biguint64[0] = 42n;
console.log(biguint64[0]); // 42n
console.log(biguint64.length); // 2
console.log(biguint64.BYTES_PER_ELEMENT); // 8

// From an array
const x = new BigUint64Array([21n, 31n]);
console.log(x[1]); // 31n

// From another TypedArray
const y = new BigUint64Array(x);
console.log(y[0]); // 21n

// From an ArrayBuffer
const buffer = new ArrayBuffer(64);
const z = new BigUint64Array(buffer, 8, 4);
console.log(z.byteOffset); // 8

// From an iterable
const iterable = (function* () {
  yield* [1n, 2n, 3n];
})();
const biguint64FromIterable = new BigUint64Array(iterable);
console.log(biguint64FromIterable);
// BigUint64Array [1n, 2n, 3n]

Specifications

Specification
ECMAScript® 2027 Language Specification # sec-typedarray-constructors

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`BigUint64Array`	67	79	68	54	15	67	68	48	15	9.0	67	15	1.0.0	1.0	10.4.0