Revealing Proptotype Pattern

by toby3105

HTML

<div id="output"></div>

JavaScript

var Calculator = function (eq){
    this.eqCtl = document.getElementById(eq);  
};

Calculator.prototype = function(){
    var add = function(x,y){
        this.eqCtl.innerHTML = x+y;
    };
    return{
        add:add
    };
}();

var calc = new Calculator("output");
console.log("call")
calc.add(2,5);