byteLength Property (Float32Array)


Read-only. The length of this array from the start of its ArrayBuffer, in bytes, as fixed at construction time.

var arrayByteLength = float32Array.byteLength;


The following example shows how to get the length of the array.

var req = new XMLHttpRequest();'GET', "");
    req.responseType = "arraybuffer";

    req.onreadystatechange = function () {
        if (req.readyState === 4) {
            var buffer = req.response;
            var dataView = new DataView(buffer);
            var floatArr = new Float32Array(buffer.byteLength) / 4);


Supported in the following document modes: Internet Explorer 10 standards and Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

Not supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards.