S.O.L.I.D Design Principles

SOLID is an ancronym which stands for:-

S - Single Responsibility Principle
O - Open/Closed Principle
L - Liskov Substitution Principle
I - Interface Segregation Principle
D - Dependency Inversion Principle

Single Responsibility Principle

A class should have one and only one reason to change, meaning that a class should have only one job.

Open/Closed Principle

A class should be open to addition/extension but closed for modification.

Liskov Substitution Principle

If a class B that inherits from class A. Then anywhere in the application where class A is used should be able to substitute for class B and application should continue to work.

Interface Segregation Principle

Many smaller client specific interfaces are better than larger ones.

Dependency Inversion Principle

Thourgh out the application a class should only be dependent on interface and not on concrete class.