Understanding Prototypal Inheritance in JavaScript | LakTEK

A good basic description of the Prototypal Inheritance in JavaScript:

Understanding Prototypal Inheritance in JavaScript

02 February 2011

Behavior reuse is one of the key aspects of Object Oriented programming. Many mainstream Object Oriented languages, achieves behavior reuse by using class based inheritance. In class based inheritance, a class defines how objects stemming from it should behave.

However, not all languages use class based inheritance to achieve behavior reuse. The best possible example is JavaScript. It doesn’t have a concept of classes. Some people often confused about JavaScript’s object oriented capabilities due to this fact. But in reality, JavaScript is a more expressive and flexible Object Oriented language compared to some of the mainstream languages.

If JavaScript doesn’t have class based inheritance, how does it reuse the behavior? For that it follows the technique called Prototypal Inheritance.

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