OOP in JavaScript

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OOP, also known as object-oriented programming

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Class

It is the design or blurprint of any entity, which defines the core properties and functions.

Object

An object is an inheritance of a class which has physical existence.

My name is edith, and I am an object of class Female.

HumanBeing, Male or Female, we just mean a type/kind.

You, me, our friends, have physical existence, while class is just a logical definition.

Inheritance

In OOP, the meaning of inheritance is very close to its actual meaning in English.

Abstraction

Abstraction means hiding the details from the outside world.

Get the details hidden from the outside world and take a ‘skin’ as the abstraction factor to hide the inside mechanism from the outside world.

Encapsulation

Encapsulation refers to binding properties with functions.

Polymorphism

Polymorphism means “many forms”. It allows us to define more than one way to do something., either by using a different proces sfor it or by using different parts to do it.

Polymorphism methods:

• Overriding: Everyone walks in the direction of his face. If one walks while facing the other direction, this is overriding. When you change the mechanism of function, it is called “overriding”
• Overloading: When we use our hands, not our legs, to walk, overloading occurs.

  class HumanBeing:
      def walk(hands):
          print "Walk using our hands"
          print "this is overloading"
  

A metaphor

• class: HumanBeing

  • Properties: Body Parts
    • Hands
    • Legs
    • Eyes…
  • Functions: Body functions:
    • Walk()
    • Talk()
    • See()