📖Software design for flexibility: how to avoid programming yourself into a corner

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.”