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1/ When coding, don't underestimate the power of state to confuse you! I was reminded of this recently. If confused by code (your's or anybody else's), the first thing to do make as many things immutable as possible, remove redundant concepts, and prefer calculation over state.
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.
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