📖Software Design for Flexibility: How to Avoid Programming Yourself into a Corner

Hanson, Chris
  • p.2 “additive programming” (re open-closed principle)
  • p.3 Postel’s law: “an implementation should be conservative in its sending bahavior, and liberal in its receiving behavior”
  • p.7 electronics is very composable because components have clear interfaces that describe their inputs and behavior. for each interface, there can be different compatible implementations
  • p.9 “biological systems use contextual signals that are informative rather than imperative”
  • p.53 “A good program must be written many times. […] The first draft may not clearly separate out the concerns, but by making that draft the programmer learns the structure of the problem.”


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