Single responsibility principle
a class should have only a single responsibility (i.e. only one potential change in the software’s specification should be able to affect the specification of the class)
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.
Interface segregation principle
many client-specific interfaces are better than one general-purpose interface.
Dependency inversion principle
Depend upon Abstractions. Do not depend upon concretions. Dependency injection is one method of following this principle.
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