Discussion on: Understanding SOLID Principles: Liskov Substitution Principle

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Replies for: I will implement the ReadonlyDocument.save() like this : if instanceof(doc) is ReadonlyDocment : throw an Error else : super().save()

Instanceof is a antipattern, if you need add new subtypes, requiere add other validation and you client is hight coupled with subtypes, if you change the subtypes class need change on client ( break Open Close)