This repo contains the presentation and exercises relevant to the Oslo-Haskell meetup on polymorphism: http://www.meetup.com/Oslo-Haskell/events/221411891/
The presentation is in pres.pdf.
For the exercises, start with Polymorphism.hs and continue to State.hs and/or FoldAndTraverse.hs.
Replace all the 'todo's for great profit! HINT: comment out the 'todo' declaration, compile the file & see all the compilations errors to find out what exercises you have not completed yet. :-]
For more polymorphism theory and exercises, see the Typeclassopedia from the Haskell wiki: https://wiki.haskell.org/Typeclassopedia