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/ MyState.hs
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January 6, 2020 09:34
— forked from merijn/MyState.hs
MyState homework solution
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| data MyState s a = MyState (s -> (a,s)) | |
| get :: MyState s s | |
| get = MyState (\s -> (s, s)) | |
| put :: s -> MyState s () | |
| put s = MyState (\_ -> ((), s)) | |
| modify :: (s -> s) -> MyState s () | |
| modify f = MyState (\s -> ((), f s)) |