BigUint64Array() constructor

The BigUint64Array() typed array constructor creates a new BigUint64Array object, which is, 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. 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 BigUint64Array()
new BigUint64Array(length)
new BigUint64Array(typedArray)
new BigUint64Array(object)

new BigUint64Array(buffer)
new BigUint64Array(buffer, byteOffset)
new BigUint64Array(buffer, byteOffset, length)

Note: BigUint64Array() can only be constructed with new. Attempting to call it without new throws a TypeError.




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);
// BigUint64Array [1n, 2n, 3n]


ECMAScript Language Specification
# sec-typedarray-constructors

Browser compatibility

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See also