W3cubDocs

DataView.prototype.setFloat64()

The setFloat64() method of DataView instances takes a number and stores it as a 64-bit floating point number in the 8 bytes starting at the specified byte offset of this DataView. There is no alignment constraint; multi-byte values may be stored at any offset within bounds.

Try it

Syntax

setFloat64(byteOffset, value)
setFloat64(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. For how the value is encoded in bytes, see Value encoding and normalization.
littleEndian Optional: Indicates whether the data is stored in little- or big-endian format. If false or undefined, a big-endian value is written.

Return value

undefined.

Exceptions

RangeError: Thrown if the byteOffset is set such that it would store beyond the end of the view.

Examples

Using setFloat64()

const buffer = new ArrayBuffer(10);
const dataview = new DataView(buffer);
dataview.setFloat64(0, 3);
dataview.getFloat64(1); // 3.785766995733679e-270

Specifications

Specification
ECMAScript Language Specification # sec-dataview.prototype.setfloat64

Browser compatibility

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`setFloat64`	9	12	15	12.1	5.1	18	15	12.1	5	1.0	4	1.0	0.10.0