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36 lines
896 B
Idris
36 lines
896 B
Idris
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module Main
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namespace App2
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public export
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(<*>) : Applicative f => Applicative g =>
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f (g $ a -> b) -> f (g a) -> f (g b)
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fgf <*> fga = Prelude.[| fgf <*> fga |]
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public export
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pure : Applicative f => Applicative g =>
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a -> f (g a)
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pure = Prelude.pure . Prelude.pure
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namespace App3
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public export
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(<*>) : Applicative f => Applicative g => Applicative h =>
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f (g (h $ a -> b)) -> f (g (h a)) -> f (g (h b))
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fgf <*> fga = App2.[| fgf <*> fga |]
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public export
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pure : Applicative f => Applicative g => Applicative h =>
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a -> f (g (h a))
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pure = App2.pure . Prelude.pure
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list : List (Maybe Integer)
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list = [Just 3, Just 7, Nothing, Just 0]
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test2 : List (Maybe Integer)
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test2 = App2.[| list + list |]
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test3 : Either String (List (Maybe Integer))
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test3 = App3.[| Right list + Right list |]
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main : IO ()
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main = printLn test2 >> printLn test3
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