Converting ArrayBuffer to int in Javascript

Question

I am trying to convert an ArrayBuffer to an int using JavaScript. My app uses WebSocket and on the Sender side I have an integer between 0 and 4. I convert this ArraySegment in C#. I send this via web sockets to my JavaScript client which receives it as an ArrayBuffer.

The ArrayBuffer now holds the value of 0 or 1 or 2 or 3. How can I 'read' that value?

Answer 1

Use DataView:

var buffer = new ArrayBuffer(16);
var dv = new DataView(buffer, 0);

dv.setInt16(1, 42);
dv.getInt16(1); //42

Answer 2

var i = new Uint8Array(buf)[0];

Then i is what you need. If you need subarray():

ArrayBuffer.prototype.subarray = function (a, b) {
    var u = new Uint8Array(this);
    return new Uint8Array(u.subarray(a, b)).buffer;;
};

and

var i = new Uint8Array(buf.subarray(0,1))[0];