BigInt64Array

BaselineWidely available

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

TheBigInt64Array typed array represents an array of 64-bit signed 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).

BigInt64Array is a subclass of the hiddenTypedArray class.

Try it

const buffer = new ArrayBuffer(24);const bigint64 = new BigInt64Array(buffer);bigint64[0] = 5886014448488689n;bigint64[1] = 1881938909131133n;bigint64[2] = 1898875537769492n;bigint64[0] = 6118793953620967n;console.log(bigint64);// Expected Output: BigInt64Array [6118793953620967n, 1881938909131133n, 1898875537769492n]console.log(bigint64[2]);// Expected Output: 1898875537769492nconsole.log("Array length:", bigint64.length);// Expected Output: Array length: 3console.log("Array byte length:", bigint64.byteLength);// Expected Output: Array byte length: 24console.log("Array byte offset:", bigint64.byteOffset);// Expected Output: Array byte offset: 0bigint64.set([100n, 200n], 1);console.log(bigint64);// Expected Output: BigInt64Array [6118793953620967n, 100n, 200n]

Constructor

BigInt64Array(): Creates a newBigInt64Array object.

Static properties

Also inherits static properties from its parentTypedArray.

BigInt64Array.BYTES_PER_ELEMENT: Returns a number value of the element size.8 in the case ofBigInt64Array.

Static methods

Inherits static methods from its parentTypedArray.

Instance properties

Also inherits instance properties from its parentTypedArray.

These properties are defined onBigInt64Array.prototype and shared by allBigInt64Array instances.

BigInt64Array.prototype.BYTES_PER_ELEMENT: Returns a number value of the element size.8 in the case of aBigInt64Array.
BigInt64Array.prototype.constructor: The constructor function that created the instance object. ForBigInt64Array instances, the initial value is theBigInt64Array constructor.

// From a lengthconst bigint64 = new BigInt64Array(2);bigint64[0] = 42n;console.log(bigint64[0]); // 42nconsole.log(bigint64.length); // 2console.log(bigint64.BYTES_PER_ELEMENT); // 8// From an arrayconst x = new BigInt64Array([21n, 31n]);console.log(x[1]); // 31n// From another TypedArrayconst y = new BigInt64Array(x);console.log(y[0]); // 21n// From an ArrayBufferconst buffer = new ArrayBuffer(64);const z = new BigInt64Array(buffer, 8, 4);console.log(z.byteOffset); // 8// From an iterableconst iterable = (function* () {  yield* [1n, 2n, 3n];})();const bigint64FromIterable = new BigInt64Array(iterable);console.log(bigint64FromIterable);// BigInt64Array [1n, 2n, 3n]