Edit in JSFiddle

function awesome(a,b,c) {
    var args = Array.prototype.slice.call(arguments);
    if(args.length == 2)
    {
        a = "awesome!";
        b = args[0];
        c = args[1];
    }
    console.log(a)
    console.log(b)
    console.log(c)
}



awesome(2,3);