a simple way to avoid memory locator detecting a number's address;

safeNumber.js

var addProperty = function(obj, property, value) {
    var salt = Math.random(), saltValue;

    var saltGetter = function() {
        return saltValue * salt;
    };

    var saltSetter = function(value) {
        saltValue = value / salt;
    };

    saltSetter(value);

    Object.defineProperty(obj, property, {
        get: saltGetter,
        set: saltSetter
    });
};

var Hero = function() {
    addProperty(this, "hp", 50);
    addProperty(this, "mp", 50);
};

var player = new Hero();
console.log(player.hp); // 50
console.log(player.mp); // 50
player.hp = 100;
player.mp = 75;
console.log(player.hp); // 100
console.log(player.mp); // 75