Turnstile State Machine
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type State = Locked | Unlocked
type Input = Coin | Push
let next state input =
match state, input with
| Locked, Coin -> Unlocked
| Unlocked, Push -> Locked
| _ -> state
printfn "%A" (next Locked Coin)
printfn "%A" (List.ofSeq (Seq.scan next Locked [Coin; Coin; Push; Push; Coin]))
Fsharp
INFO