[Haskell-beginners] basic use of Applicative

[Imants Cekusins]

> Try explaining them to increase your understanding

Functor:
take a polymorphic type e.g. Maybe a
define a functor instance for it (fmap)

now we can write an  (a -> a) function and apply it to the polymorphic type


Applicative:
allows to apply (a -> ... -> a) to the polymorphic type for which
Functor & Applicative instance is defined

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