BigUint64Array
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 typed array represents an array of 64-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0n unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
BigUint64Array is a subclass of the hidden TypedArray class.
Constructor
BigUint64Array()-
Creates a new
BigUint64Arrayobject.
Static properties
Also inherits static properties from its parent TypedArray.
BigUint64Array.BYTES_PER_ELEMENT-
Returns a number value of the element size.
8in the case ofBigUint64Array.
Static methods
Inherits static methods from its parent TypedArray.
Instance properties
Also inherits instance properties from its parent TypedArray.
These properties are defined on BigUint64Array.prototype and shared by all BigUint64Array instances.
BigUint64Array.prototype.BYTES_PER_ELEMENT-
Returns a number value of the element size.
8in the case of aBigUint64Array. BigUint64Array.prototype.constructor-
The constructor function that created the instance object. For
BigUint64Arrayinstances, the initial value is theBigUint64Arrayconstructor.
Instance methods
Inherits instance methods from its parent 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® 2026 Language Specification # sec-typedarray-objects |
Browser compatibility
Loading…