BigUint64Array

BaselineWidely available

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

TheBigUint64Array typed array represents an array of 64-bit unsigned integers in the platform byte order. If control over byte order is needed, useDataView instead. The contents are initialized to0n 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 hiddenTypedArray class.

Constructor

BigUint64Array(): Creates a newBigUint64Array object.

Static properties

Also inherits static properties from its parentTypedArray.

BigUint64Array.BYTES_PER_ELEMENT: Returns a number value of the element size.8 in the case ofBigUint64Array.

Static methods

Inherits static methods from its parentTypedArray.

Instance properties

Also inherits instance properties from its parentTypedArray.

These properties are defined onBigUint64Array.prototype and shared by allBigUint64Array instances.

BigUint64Array.prototype.BYTES_PER_ELEMENT: Returns a number value of the element size.8 in the case of aBigUint64Array.
BigUint64Array.prototype.constructor: The constructor function that created the instance object. ForBigUint64Array instances, the initial value is theBigUint64Array constructor.

// From a lengthconst biguint64 = new BigUint64Array(2);biguint64[0] = 42n;console.log(biguint64[0]); // 42nconsole.log(biguint64.length); // 2console.log(biguint64.BYTES_PER_ELEMENT); // 8// From an arrayconst x = new BigUint64Array([21n, 31n]);console.log(x[1]); // 31n// From another TypedArrayconst y = new BigUint64Array(x);console.log(y[0]); // 21n// From an ArrayBufferconst buffer = new ArrayBuffer(64);const z = new BigUint64Array(buffer, 8, 4);console.log(z.byteOffset); // 8// From an iterableconst iterable = (function* () {  yield* [1n, 2n, 3n];})();const biguint64FromIterable = new BigUint64Array(iterable);console.log(biguint64FromIterable);// BigUint64Array [1n, 2n, 3n]