School Blog Help Feedback Login DanBurton / 20 intermediate exercises 4 Mar 2013 DanBurton View Markdown source Next content: I/O in Haskell for Java programmers See all content by DanBurton View all published content View all users with published content Learn how our Stackage project is helping solve Haskell's stable library problem. Blog The latest updates on everything Haskell. Haskell news by Chris Done. Haskell News Favorite Tweets by @FPComplete Instructions Instructions Fill in the blanks (which are marked error "todo" ) with a nontrivial implementation that typechecks. I recommend that you use the run button after implementing each one to make sure that it still typechecks. Let the types guide you! If you have trouble implementing a typeclass method, then try writing out the speci...