Day 10 : TypeScript

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       In this blog we are going to understand the abstract and interface.

Abstract class :

  • Semantically an abstract class is a half defined parent class.
  • An abstract class is mainly used for inheritance where other classes derive from them.
  • Abstract class is defined using "abstract" keyword.
  • We cannot create instance of an abstract class.
  • The classes which extends the abstract class must define all the abstract methods.
  • The abstract classes not contain the function or method body.

Example :


Generalization :

  • Generalization is a another word for parent class.
  • Generalization is the process of extracting shared characteristics from two or more classes and combining them into a class or superclass.

Specialization :

  • Specialization is a another word for child class.
  • Specialization is the process of creating new subclasses from old one.
  • The child class also named as concrete class.


Interface :

  • An interface is an abstract type but not contain any code like a class.
  • An interface is a contract which defines a function with respect to parameters or arguments and data types.
  • Interface supports multiple inheritance.
  • Interface can't contains the implementation of abstract class.
  • Interface is declared using "interface" keyword.
  • Interface can be implemented using "implements" keyword.
  • Syntax :
                                       public interface Sample
                                        {
                                               void work();
                                        }

* Interface can have the abstract, default and static methods *


Thank You!!!

For more understanding watch below video :

JavaScript Day 1 : Day 1

JavaScript Day 2 Global Pollution : Day 2 Global

JavaScript Day 2  Undefined and Hoisting : Day 2 Undefined

JavaScript Day 3 : Day 3

JavaScript Day 4 : Day 4

JavaScript Day 5 : Day 5

JavaScript Day 6 : Day 6

TypeScript Day 7 : Day 7

TypeScript Day 8 : Day 8

TypeScript Day 9 : Day 9

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