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When I think defensive programming i am not thinking about some whacky standard- i think about a mindset. The mindset of having two entities- you and the client, the client can be you tomorrow, it is just a placeholder for someone that somehow uses your creation.
Now- you are in a situation where you have to design something to accomplish something. Now comes your toolbox of encapsulation, syntax and design patterns. What you create - should be impossible to use wrong by the client. Needing to remember to call an init? No way! crazy
You never create something that opens op for creating bugs- and you can do soooo much with just the built in classes. You only make constructors that create an object in a fully functioning state. Antthing else is bad design- the is always alternatives.
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