BigInt64Array() constructor

The BigInt64Array() typed array constructor creates a new BigInt64Array object, which is, an array of 64-bit signed integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0n. Once established, you can reference elements in the array using the object's methods, or by using standard array index syntax (that is, using bracket notation).


new BigInt64Array()
new BigInt64Array(length)
new BigInt64Array(typedArray)
new BigInt64Array(object)

new BigInt64Array(buffer)
new BigInt64Array(buffer, byteOffset)
new BigInt64Array(buffer, byteOffset, length)

Note: BigInt64Array() can only be constructed with new. Attempting to call it without new throws a TypeError.




Different ways to create a BigInt64Array

// From a length
const bigint64 = new BigInt64Array(2);
bigint64[0] = 42n;
console.log(bigint64[0]); // 42n
console.log(bigint64.length); // 2
console.log(bigint64.BYTES_PER_ELEMENT); // 8

// From an array
const x = new BigInt64Array([21n, 31n]);
console.log(x[1]); // 31n

// From another TypedArray
const y = new BigInt64Array(x);
console.log(y[0]); // 21n

// From an ArrayBuffer
const buffer = new ArrayBuffer(64);
const z = new BigInt64Array(buffer, 8, 4);
console.log(z.byteOffset); // 8

// From an iterable
const iterable = function*() { yield* [1n, 2n, 3n]; }();
const bigint64FromIterable = new BigInt64Array(iterable);
// BigInt64Array [1n, 2n, 3n]


ECMAScript Language Specification
# sec-typedarray-constructors

Browser compatibility

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See also