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copied!<p>I think all this discussion of prototypes is overkill, and not really all that helpful to your situation. You don't really need a prototype here, since all your instances of <code>Mario</code> are going to have their own value for <code>currentHp</code>. Likewise, you don't need to make <code>Mario</code> a true constructor and worry about having to remember the <code>new</code> keyword (although you can if you want).</p> <p>As far as I can tell, everything you're trying to do can be handled by closures, with the added bonus of keeping your private members (like <code>baseHP</code> and your logic for calculating HP) truly private. Try this:</p> <pre><code>var Mario = (function () { //"private" variable encapsulated by the closure var baseHp = 1; //"private" method for calculating HP given an instance's current HP var getHp = function (currentHp, value) { return currentHp * Enemy.baseHp + (value || 0); }; //in OOP terms, baseHp and getHp would be like private static members used by //the whole class. return function () { //another "private" variable, but this one is only for //the current instance. var currentHp = baseHp * 100; //instance: return { name: "Mario", hp: function (value) { return !!value ? currentHp = getHp(currentHp, value) : getHp(currentHp); } }; }; })(); </code></pre> <p>I've tested this in the console, and it seems to work fine:</p> <pre><code>//test var Enemy = { baseHp: 3 }; var log = console.log.bind(console); var mario = Mario(); //or new Mario(); either one is fine log(mario); log(mario.hp()); log(mario.hp(-20)); log(mario.hp()); </code></pre> <p>Try it out on jsFiddle: <a href="http://jsfiddle.net/jmorgan123/zkw2P/" rel="nofollow">http://jsfiddle.net/jmorgan123/zkw2P/</a></p>

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