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JavaScript doesnt have classes internally though it has a class keyword but when we create a class it actually creates a function object along with its prototype now it also allows us to go ahead and inherit or extend classes what it does this creates more function object but in this case it connects it connects the prototypes when we create objects these objects go through prototype chaining to find properties and Method so if you say I deposit it looks for deposit here doesnt find it goes here doesnt find it goes here finds it and executes this one which is the base class however if you say withdraw it starts searching for it here doesnt find it goes here finds it so it doesnt go any further executes this one now this makes it look very much like regular class based object-oriented language so here is the same example you deposit and you draw extending the class while overriding the method so if we create an object of savings account sorry account run it we see that the balance