SOLID – Liscov Substitution

Objects in a program should be replaceable with instances of their sub-types without altering the correctness of that program

Robert C. Martin

“At the beginning, keep things simple and concrete – stick to that as long as possible/necessary.” 

“Correct abstractions usually come after careful thinking and initial minimal, concrete implementation” 

“Incorrect abstractions usually come from wrong presumptions and over-engineered ideas” 

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