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2/ Make state changes transnational and in one place as opposed to one off changes spread out all over the place. Remove as many conditionals as possible, and generally depending on checking null by client code is an antipattern for the same general reasons.
3/ The goal first and foremost is to make this stuff fit in your head! If it doesn't, you're just going to be reduced to a combination of frustration and endless trial/error resulting in lots of bugs.
so true!
A lot of good design aims for this. Easy debugging is a natural fallout of good design.
Great point. I think this stands in contrast to "easy to unit test" as TDD advocates, because that often doesn't necessarily lead to easy to understand/debug code.
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