SOLID is an acronym for five object-oriented design principles.
S– Single responsibility principle
O– Open-closed principle
L– Liskov substitution principle
I– Interface segregation principle
D– Dependency Inversion Principle
The intention behind these five principles is to promote flexible, understandable and maintainable code.
The Single Responsibility Principle asserts that a class should have only one responsibility. This single responsibility should be entirely encapsulated by the class.
The Open-Closed Principle specifies that software entities should be open for extension but closed for modification.
The Liskov Substitution Principle asserts that a subtype, of type, property can be replaced by type property without altering the result or behaviour.
p(T) = p(S) => same result/behaviour
Interface segregation defines that interfaces should be small and focused instead of large and lost in functionality. In Object Oriented Programming a class can implement several interfaces so each class should only implement what is relevant to them.
Dependency Inversion determines that entities must depend on abstractions, not on concretions. A high-level module must not depend on a low-level module, and both should depend on abstractions. Following this principle reduces objects coupling.
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