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(.module:
[library
[lux #*
[abstract
[monoid (#+ Monoid)]]]])
(def: .public identity
(All [a] (-> a a))
(|>>))
(def: .public (composite f g)
(All [a b c]
(-> (-> b c) (-> a b) (-> a c)))
(|>> g f))
(def: .public (constant value)
(All [o] (-> o (All [i] (-> i o))))
(function (_ _) value))
(def: .public (flipped f)
(All [a b c]
(-> (-> a b c) (-> b a c)))
(function (_ x y) (f y x)))
(def: .public (on input function)
(All [i o]
(-> i (-> i o) o))
(function input))
(implementation: .public monoid
(All [a] (Monoid (-> a a)))
(def: identity ..identity)
(def: compose ..composite))
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