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javascript instance method

DataView.prototype.setFloat64()

View on MDN ↗

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.

Interactive exampleOpen the canonical MDN source to run this embedded demo.
// 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

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
  • 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()

const buffer = new ArrayBuffer(10);
const dataview = new DataView(buffer);
dataview.setFloat64(0, 3);
dataview.getFloat64(1); // 3.785766995733679e-270

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.

See also