BigInt64Array
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.
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 new
BigInt64Arrayobject.
Static properties
Also inherits static properties from its parentTypedArray.
BigInt64Array.BYTES_PER_ELEMENTReturns a number value of the element size.
8in 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_ELEMENTReturns a number value of the element size.
8in the case of aBigInt64Array.BigInt64Array.prototype.constructorThe constructor function that created the instance object. For
BigInt64Arrayinstances, the initial value is theBigInt64Arrayconstructor.
Instance methods
Inherits instance methods from its parentTypedArray.
Examples
Different ways to create a BigInt64Array
// 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]Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-typedarray-objects |