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1. The Free On-line Dictionary of Computing (30 December 2018)
functor

   In category theory, a functor F is an operator on types.  F
   is also considered to be a polymorphic operator on functions
   with the type

   	F : (a -> b) -> (F a -> F b).

   Functors are a generalisation of the function "map".  The
   type operator in this case takes a type T and returns type
   "list of T".  The map function takes a function and applies it
   to each element of a list.

   (1995-02-07)


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