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
orundefined
, 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® 2025 Language Specification # sec-dataview.prototype.getfloat64 |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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getFloat64 |
Legend
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- Full support
- Full support