Lucas WintherandClaude Fable 5.2
edd57f0148
Audit pass: - Frame rule counts frames since the last move, so every step lasts exactly movesEvery(score) frames, also right after a speed-up - clampTime + MAX_GAP_MS: a hidden tab no longer replays the whole gap - Pong Restart keeps held keys - Fact corrections (mulberry32 output coverage, Haskell IO, uniform) - New fixture cases from a mutation analysis Extensions (all three tracks, shared fixtures, course text): - Turn queue (Exercise 10.6), persisted high score (10.7), replay viewer (10.8), play() end-to-end helper (9.5) - Optional State (4.7) and optional Module 7b, stack-safe IO - Module 12, property-based testing with generators, shrinking, invariants and a model-based oracle - Module 13, Conway's Life with a Click event - JS type checking via jsconfig, JSDoc and types.d.ts - Maintainer tools: scripts/mutate.mjs, scripts/typecheck-js.sh, Playwright end-to-end suite (e2e/, scripts/e2e.sh) Docs: docs/contract.md is the canonical contract; specs and build log under docs/superpowers. Verified: JS 728, Scala 689, F# 691 unit tests; stubs and progression M01-M13 and M07b; 176 end-to-end tests on Chromium and WebKit. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
33 lines
1.0 KiB
Scala
33 lines
1.0 KiB
Scala
package snake
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/**
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* m04 state (optional, Exercise 4.7): the general pattern behind Random. A State[S, A] is a function
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* s => (A, nextS): it reads a state, produces a value and hands on a new state. Random[A] is State[Long, A].
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* Nothing in the game uses this file; it is here to show that Random was one example of a bigger idea.
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*/
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final case class State[S, A](run: S => (A, S)):
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def map[B](f: A => B): State[S, B] =
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State { s =>
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val (a, next) = run(s)
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(f(a), next)
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}
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def flatMap[B](f: A => State[S, B]): State[S, B] =
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State { s =>
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val (a, next) = run(s)
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f(a).run(next)
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}
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object State:
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def pure[S, A](a: A): State[S, A] = State(s => (a, s))
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/** The current state as the value; the state is left untouched. */
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def get[S]: State[S, S] = State(s => (s, s))
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/** Replace the state with `s`; there is no interesting value, so it is `()`. */
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def put[S](s: S): State[S, Unit] = State(_ => ((), s))
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def modify[S](f: S => S): State[S, Unit] = State(s => ((), f(s)))
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