SOLID Design Principles

Presentation on theme: "SOLID Design Principles"— Presentation transcript:

Slide1

SOLID Design PrinciplesSlide2

SOLID Stands

For

Single responsibility

Open-closed

Liskov

substitution

Interface segregation 

Dependency

inversion

The principles, when applied together, intend to make

easy

to maintain and extend over

time systemSlide3

S – SRP -

Single responsibility

principle

Every class, function, variable

should define a single responsibility, and that responsibility should be entirely encapsulated by the

context

It

is important to keep a class focused on a single concern is that it makes the class more

robustSlide4

O –OCP -

Open/closed principle

software entities (classes, modules, functions, etc.) should be open for extension, but closed for

modification

 that is, such an entity can allow its

behavior

to be extended without modifying

its source code

This is especially valuable in a production environment, where changes to source code may necessitate code

reviews, unit

tests, and other such procedures to qualify it for use in a productSlide5

L

– LSP -

Liskov

substitution principle

It is

a particular definition

of a

 subtyping 

relation

, called 

behavioral subtyping

If

S is a subtype of T, then objects of type T may be replaced with objects of type

S without

altering any of the desirable properties of that program Slide6

I – ISP -

Interface segregation principle

It

 states that no client should be forced to depend on methods it does not

use

 ISP splits interfaces which are very large into smaller and more specific ones so that clients will only have to know about the methods that are of interest to

them

 Slide7

D

– DIP -

Dependency inversion principle

High-level modules should not depend on low-level modules. Both should depend on abstractions

Abstractions should not depend on details. Details should depend on abstractions.Slide8

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