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SOLID (wiki):

• Single responsibility principle

  • a class should have only a single responsibility (i.e. changes to only one part of 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." 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, [not] concretions."

• See https://scotch.io/bar-talk/s-o-l-i-d-the-first-five-principles-of-object-oriented-design

• See https://hackernoon.com/solid-principles-made-easy-67b1246bcdf