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.

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Syntax

js

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()

js

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

BCD tables only load in the browser

See also