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
js
new BigUint64Array()
new BigUint64Array(length)
new BigUint64Array(typedArray)
new BigUint64Array(object)
new BigUint64Array(buffer)
new BigUint64Array(buffer, byteOffset)
new BigUint64Array(buffer, byteOffset, length)
Parameters
See TypedArray.
Exceptions
See TypedArray.
Examples
Different ways to create a BigUint64Array
js
// 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® 2026 Language Specification # sec-typedarray-constructors |