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Page, three Before/After example pairs (Scala 3 + Haskell), hedgehog
specs (equivalence + naturality square per example), koan and example
diagrams, catalogue slug and Jekyll exclude.
Examples escalate by what the arrow preserves:
01 stack-vector - iso: Stack/List wrapper, toList/fromList
02 dictionary-set - invariant: Map -> Set[(K,V)] via entries
03 either-option - forgetful: Either -> Option via toOption
(Before is a Result class that is-a both views; quantity
returns Option[Int] / Maybe Int)
Includes review round 1: histories build oldest-first so replay
needs no reverse; intro and The move condensed to one paragraph;
inverse legitimized where the is-a holds strictly.
NOT YET VERIFIED: no scala-cli, GHC/Docker or Ruby on the drafting
machine; run run.sh, mutation checks and the Jekyll build before PR.
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Page, three Before/After example pairs (Scala 3 + Haskell), hedgehog specs (equivalence + naturality square per example), koan and example diagrams, catalogue slug and Jekyll exclude.
Examples escalate by what the arrow preserves:
01 stack-vector - iso: Stack/List wrapper, toList/fromList
02 dictionary-set - invariant: Map -> Set[(K,V)] via entries
03 either-option - forgetful: Either -> Option via toOption
(Before is a Result class that is-a both views; quantity
returns Option[Int] / Maybe Int)
Includes review round 1: histories build oldest-first so replay needs no reverse; intro and The move condensed to one paragraph; inverse legitimized where the is-a holds strictly.
NOT YET VERIFIED: no scala-cli, GHC/Docker or Ruby on the drafting machine; run run.sh, mutation checks and the Jekyll build before PR.