DataView.prototype.byteLength
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 byteLength
accessor property of DataView
instances returns the length (in bytes) of this view.
Try it
Description
The byteLength
property is an accessor property whose set accessor function is undefined
, meaning that you can only read this property. The value is established when an DataView
is constructed and cannot be changed. If the DataView
is not specifying an offset or a byteLength
, the byteLength
of the referenced ArrayBuffer
or SharedArrayBuffer
will be returned.
Examples
Using the byteLength property
js
const buffer = new ArrayBuffer(8);
const dataview = new DataView(buffer);
dataview.byteLength; // 8 (matches the byteLength of the buffer)
const dataview2 = new DataView(buffer, 1, 5);
dataview2.byteLength; // 5 (as specified when constructing the DataView)
const dataview3 = new DataView(buffer, 2);
dataview3.byteLength; // 6 (due to the offset of the constructed DataView)
Specifications
Specification |
---|
ECMAScript Language Specification # sec-get-dataview.prototype.bytelength |
Browser compatibility
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