DataView.prototype.getBigInt64() - JavaScript | MDN
Try it
// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);
// Highest possible BigInt value that fits in a signed 64-bit integer
const max = 2n ** (64n - 1n) - 1n;
const view = new DataView(buffer);
view.setBigInt64(1, max);
console.log(view.getBigInt64(1));
// Expected output: 9223372036854775807n
Syntax
js
getBigInt64(byteOffset)
getBigInt64(byteOffset, littleEndian)
Parameters
byteOffset-
The offset, in bytes, from the start of the view to read the data from.
littleEndianOptional-
Indicates whether the data is stored in little- or big-endian format. If
falseorundefined, a big-endian value is read.
Return value
A BigInt from -263 to 263-1, inclusive.
Exceptions
RangeError-
Thrown if the
byteOffsetis set such that it would read beyond the end of the view.
Examples
Using getBigInt64()
js
const { buffer } = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
const dataview = new DataView(buffer);
console.log(dataview.getBigInt64(1)); // 72623859790382856n
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-dataview.prototype.getbigint64 |