WTF is S.O.L.I.D – WTF is I ?

I = Interface Segregation Principle

This is all about separating your interfaces and making them smaller. Since we don’t want to end up having mega interfaces with a tons of properties, and methods, that may or may not be used by classes that implement them. If you don’t follow this principle you are probably gonna end up with a hair ball of OOP design. That will lead to harder refactors further down the line. For example lets say you have a “Entity” interface, that has properties “attackDamage”, “health”, and also has methods “move”, “attack”, and “takeDamage”.  Now lets say classes “Player”, “Enemy” , “Chair”, and “MagicChest” implement it. Does this make sense ? Should the “Chair” class need to implement the “attack” method ? Most likely no it should not, but then it does need the “name” property. So we can factor out the common piece among the classes that implement “Entity”. So instead of just having the “Entity” interface. We can have a “BaseEntity”, “ActorEntity” and “StaticObject” interface. This way we won’t have any unnecessary implementations for any of the classes that implement the interfaces.

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