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DataView.prototype.getFloat64()

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.

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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 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	Deno	Node.js
`getFloat64`	9	12	15	12.1	5.1	18	15	12.1	5	1.0	4	1.0	0.10.0