So every walk is a walk, and every jump is a jump: var cat = new Animal() Now any new instance has a blue print of the class before being created. Imagine I define three functions inside the constructor, this means every single time, those functions are defined anew. This is where the problem of performance occurs. So when we call new Animal() the constructor is called immediately. this is the class and the constructor at the same time. this content will be executed when an instance is created:īut how about in JavaScript? Do we have a constructor? Yes we do, only everything in JavaScript is a weird, so the constructor is the class/function/constructor itself. Usually the Constructor function name is defined using the actual class name or the keyword constructor: // In Java A constructor is a sort of initializing function that is called every time a new instance of the class is created. In most Object Oriented programming languages a class has a constructor. When a method is defined using thodName a new copy is created every time a new object is instantiated. There is a clear reason why you should use prototypes when creating classes in JavaScript.
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