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browses to an image on their local hard drive, you will end up with a link to the image on their hard drive, which isn t accessible by anyone else.

Bird.prototype.tweet = function(){ console.log('Tweet!'); }; var cat = new Cat(); cat.eat(); // The cat is eating. cat.meow(); // 'Meow!' var bird = new Bird(); bird.eat(); // The bird is eating. bird.tweet(); // 'Tweet!' We left our original Animal constructor and prototype as they were and created two new constructors, Cat and Bird. We used empty functions for our new constructors since we didn t have anything to set inside them, but we could have as easily added some other statements inside them if needed. The default prototypes for Cat and Bird were replaced with instances of Animal, so our Cat and Bird objects will also inherit from Animal.prototype. Finally, we added proper methods to the prototypes meow for Cat and tweet for Bird. When we finally instantiated our objects, the results were two objects that inherit from both their immediate prototypes and from Animal.prototype. In classical programming languages, the process of creating a specialized version of a class by creating a new class and inheriting directly from the original class is called subclassing. JavaScript, being a prototypal language, does not have classes and, in essence, the only thing we are doing is creating a deliberate prototype chain. We say deliberate because we explicitly set which objects will be included in the prototype chain of our instances. There is no limit to the size of your prototype chain, and you can extend your chain to allow for more specialization: var Animal = function(name){ this.name = name; }; Animal.prototype.eat = function(){ console.log('The ' + this.name + 'is eating.'); }; var Cat = function(){}; Cat.prototype = new Animal('cat'); Cat.prototype.meow = function(){ console.log('Meow!'); }; var Persian = function(){ this.name = 'persian cat'; }; Persian.prototype = new Cat(); Persian.prototype.meow = function(){ console.log('Meow...'); }; Persian.prototype.setColor = function(color){

* <p>Typically a hash function on a all or a subset of the key.</p> * * @param key the key to be paritioned. * @param value the entry value. * @param numPartitions the total number of partitions. * @return the partition number for the <code>key</code>. */ int getPartition(K2 key, V2 value, int numPartitions); } The JobConfigurable interface provides an additional configure() method, as the MapReduceBase class does.

this.color = color; }; Persian.prototype.getColor = function(){ return this.color; }; var king = new Persian(); king.setColor('black'); king.getColor(); // 'black' king.eat(); // 'The persian cat is eating.' king.meow(); // 'Meow...' console.log(king instanceof Animal); // true console.log(king instanceof Cat); // true console.log(king instanceof Persian); // true Here we created a new specialized version of Cat called Persian. You ll notice that we created a Persian.prototype.meow method, which overwrites (during traversal) the original Cat.prototype.meow method for instances of Persian. If you check, you ll see that the king object is an instance of Animal, Cat, and Persian, which means our prototype chain was correctly set. The real power of prototype chains (deliberate or not) is when we see it in conjunction with inheritance and prototype chain traversal. Because all of the prototypes are linked, a change at one point in the chain will be reflected in the items below that point. If we add a new method or property to Animal.prototype, for instance, all prototypes that inherit from Animal will also receive those new members. This gives us a way to extend several objects easily and quickly. As your programs grow in complexity, deliberate chains help keep your code organized. Instead of jamming all your code into one prototype, you can create multiple prototypes that have deliberate chains to reduce the amount of code you re working with and keep your program manageable.