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 float.

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Syntax

js

getFloat64(byteOffset)
getFloat64(byteOffset, littleEndian)

Parameters

byteOffset

The offset, in byte, from the start of the view where to read the data.

littleEndian Optional

Indicates whether the 64-bit float is stored in little- or big-endian format. If false or undefined, a big-endian value is read.

Return value

A signed 64-bit float number.

Errors thrown

RangeError

Thrown if the byteOffset is set such as it would read beyond the end of the view.

Description

There is no alignment constraint; multi-byte values may be fetched from any offset.

Examples

Using the getFloat64 method

js

const buffer = new ArrayBuffer(8);
const dataview = new DataView(buffer);
dataview.getFloat64(0); // 0

Specifications

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

Browser compatibility

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See also