Wednesday, 22 February 2017

S.O.L.I.D Design Principles

The First 5 Principles of Object Oriented Design

S.O.L.I.D is an acronym for the first five object-oriented design(OOD) principles

SOLID Principles is a coding standard that all developers should have a clear concept for developing software in a proper way to avoid a bad design.
When the developer builds a software following the bad design, the code can become inflexible and more brittle, small changes in the software can result in bugs. For these reasons, we should follow SOLID Principles.


When expanded the acronyms might seem complicated, but they are pretty simple to grasp.

S – Single-responsiblity principle
O – Open-closed principle
L – Liskov substitution principle
I – Interface segregation principle
D – Dependency Inversion Principle

Let’s look at each principle individually to understand why S.O.L.I.D can help make us
better developers.

Single-responsibility Principle
S.R.P for short – this principle states that:

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

A typical example could a EmailSender class:
this should just deal with sending an email out. this should not be responsible for loading the email content from database or even formatting the email content to be sent.

Open-closed Principle

Objects or entities should be open for extension, but closed for modification. This simply
means that a class should be easily extendable without modifying the class itself.

Liskov substitution principle

All this is stating is that every subclass/derived class should be substitutable for their
base/parent class.

Interface segregation principle

A client should never be forced to implement an interface that it doesn’t use or clients
shouldn’t be forced to depend on methods they do not use.

Dependency Inversion principle
Entities must depend on abstractions not on concretions. It states that the high level module must not depend on the low level module, but they should depend on abstractions.


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