PUCK Ble HID keyboard

So I think I'm making some progress here. I've been playing around with the @allObjects solution in an editor so I can get some output in the browser.

// setup of you convenience hidKeyBoardObject... (here or later)
var hidKBD = ( 
{ 
    //member of hidKBD, currently empty
    string: "" , 
    type: function(s) {     
        this.string += s;
        if (this.string.length = s.length) {
            this._send(this.string.charAt(0));
        } 
    }, 

    //sends first character then references _sent .this so this.string in _sent will be the string from _send
    _send: function(c) { 
        console.log(c,this._sent.bind(this));
    },

    //subtracts first letter from string then passes new first letter to _send
    _sent: function() { 
        this.string = this.string.substring(1);
        if (this.string.length > 0) {
            this._send(this.string.charAt(0));
        }
    }
} );

// setup and other code functions of yours (here or before hidKBD)
//function onInit() {
// invoke your set up code as needed (init and getting connections)
hidKBD.type("ABC");
//hidKBD.type("XYZ");
//}

I've added some of my own commenting just to verify that I understand what is happening.

But due to the placement of the console.log on line 15, the log returns "A", but then the bind doesn't seem to envoke the _sent function and just prints the contents of _sent in the console:

//console output

A ƒ () { 
        this.string = this.string.substring(1);
        if (this.string.length > 0) {
            this._send(this.string.charAt(0));
        }
    }

How can I set up something so I can play with the code and have it returning a something representative of the BLE HID output to a browser.

Many thanks guys.