Applicative in Haskell

Discussion on Applicative in Haskell.

Some links for Prerequisites:

https://medium.com/@StevenLeiva1/haskell-book-chapter-11-algebraic-data-types-c83ab083c45a

http://learnyouahaskell.com/types-and-typeclasses

http://andrew.gibiansky.com/blog/haskell/haskell-typeclasses/