DataView.prototype.getFloat64()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It's been available across browsers since July 2015.

The getFloat64() method of DataView instances reads 8 bytes starting at the specified byte offset of this DataView and interprets them as a 64-bit floating point number. There is no alignment constraint; multi-byte values may be fetched from any offset within bounds.

Try it

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);

const view = new DataView(buffer);
view.setFloat64(1, Math.PI);

console.log(view.getFloat64(1));
// Expected output: 3.141592653589793

Syntax

getFloat64(byteOffset)
getFloat64(byteOffset, littleEndian)

Parameters

byteOffset: The offset, in bytes, from the start of the view to read the data from.
littleEndian Optional: Indicates whether the data is stored in little- or big-endian format. If false or undefined, a big-endian value is read.

Return value

Any number value.

Exceptions

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

Examples

Using getFloat64()

const { buffer } = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
const dataview = new DataView(buffer);
console.log(dataview.getFloat64(1)); // 8.20788039913184e-304

Specifications

Specification
ECMAScript® 2027 Language Specification # sec-dataview.prototype.getfloat64

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`getFloat64`	9	12	15	12.1	5.1	18	15	12.1	5	1.0	4	5	1.0.0	1.0	0.10.0