Principles of Programming

S.O.L.I.D. Principles

• SRP: The Single Responsibility Principle(SRP) states that each class, module in application should change only for a single reason.
• OCP: Open/Closed Principle (OCP) states that software entities (classes, modules, functions, etc.)  should be open for extension but closed for modification. A class's behaviour should be extendible without modifying its behaviour.
• LSP: Liskov Substitution Principle states that  Derived types must be substitutable for their base types.
• ISP: Interface Segregation Principle (ISP) states that Clients should not be forced to depend upon interfaces  that they don’t use. 
• DIP: Dependency Inversion Principle(DIP) states that a. Abstraction - High level modules should not depend upon low level modules, both should depend upon abstractions. b. Ownership - Low level implementation should depend on high level concepts.