I am a beginner: I have read 1½ books on Haskell. I want to practice.

Haskell is a purely functional, lazily evaluated, strongly typed (with inference) language.

Project Euler is a set of problems combining mathematics and programming. Of the 500 problems published so far I have solved 25. For the easy problems, advanced math is easily avoided by using advanced CPUs; but (re)learning bits of math is fun too.

• Solve some more problems
• Write readable code
• Follow a style guide
• Document the libraries (with Haddock)
• Have tests to catch bugs in refactoring. Try:
  • Doctest
  • HUnit
  • HSpec
  • QuickCheck (which was the tipping point for me to seriously try Haskell)
• Benchmark
• Profile
• Package (with Cabal)

The result will be a public Git repository with code and a diary to summarize things learned.