DataView.prototype.setBigUint64() - JavaScript | MDN
Try it
// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);
// Highest possible BigInt value that fits in an unsigned 64-bit integer
const max = 2n ** 64n - 1n;
const view = new DataView(buffer);
view.setBigUint64(1, max);
console.log(view.getBigUint64(1));
// Expected output: 18446744073709551615n
Syntax
js
setBigUint64(byteOffset, value)
setBigUint64(byteOffset, value, littleEndian)
Parameters
byteOffset-
The offset, in bytes, from the start of the view to store the data in.
value-
The value to set as a
BigInt. For how the value is encoded in bytes, see Value encoding and normalization. littleEndianOptional-
Indicates whether the data is stored in little- or big-endian format. If
falseorundefined, a big-endian value is written.
Return value
Exceptions
RangeError-
Thrown if the
byteOffsetis set such that it would store beyond the end of the view.
Examples
Using setBigUint64()
js
const buffer = new ArrayBuffer(10);
const dataview = new DataView(buffer);
dataview.setBigUint64(0, 3n);
dataview.getBigUint64(1); // 768n
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-dataview.prototype.setbiguint64 |