Grokking the Object Oriented Design Interview
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Keeping the Design Honest with SOLID

You have a class diagram. It is complete and it may still be a poor design.

SOLID is five rules that catch the common ways a class diagram goes wrong. The name is five initials, one per rule. This lesson is not a tour of the theory. It is five checks you can run over the diagram you just drew, in about five minutes.

Run the five checks in this order

Single responsibility. A class should have one reason to change.

Read each class name and say what it is responsible for. If the sentence needs an "and", the class is doing two jobs. Take a `ParkingLot

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