Single Responsability Principle
Open ext Close mod Principle
Liskov substitution principle
Interface segregation Principle
Dependency Inversion Principle
Single responsibility principle
A class should have only a single responsibility.
Open/closed principle
“software entities … should be open for extension, but closed for modification”.
Liskov substitution principle
“objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program”. See also design by contract.
Interface segregation principle
“many client-specific interfaces are better than one general-purpose interface.”
Dependency inversion principle
One should “Depend upon Abstractions. Do not depend upon concretions.” Dependency injection is one method of following this principle.
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