Private object var

gistfile1.js

var obj = {
    one: "wat",
    two: "wut"
};

function addPrivateVar(o, name, val) {
    
    obj[name] = (function() {
        var inner_val = val;
        
        return {
            get: function() {
                return inner_val;
            },

            set: function(new_val) {
                inner_val = new_val;
                return inner_val;
            }
        }
    }());
}

addPrivateVar(obj, "three", "wot");
addPrivateVar(obj, "four", "wat");

console.log(obj["three"].get());
console.log(obj["four"].get());

obj["four"].set("fuck");
console.log(obj["four"].get());