When comparing Haskell From First Principles vs exercism.org, the Slant community recommends exercism.org for most people. In the question“What are the best resources for a intermediate programmer to learn Haskell?” exercism.org is ranked 3rd while Haskell From First Principles is ranked 4th. The most important reason people chose exercism.org is:
Rather than merely test for code correctness, Exercism uses peer review to improve general programming techniques. Users are encouraged to comment on others' solutions, and refine their own based on feedback.
Specs
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Pros
Pro Up-to-date content
A lot of other resources are outdated and incomplete.
Pro extremely thorough
The book really doesn’t skip important details.
Pro friendly, conversational tone
Pro uses spaced repetition
The book is written so that you return to previously encountered material at the right time, which helps your memory lock concepts in.
Pro Human review and feedback
Rather than merely test for code correctness, Exercism uses peer review to improve general programming techniques. Users are encouraged to comment on others' solutions, and refine their own based on feedback.
Pro Practice with production tools
Unlike many code practice websites, Exercism requires the user to develop and test entirely offline, submitting only the finished code. This promotes familiarity with essential tools and workflow, not just the bare language.
Cons
Con Rather expensive
The book is prohibitively expensive, especially for a beginner who might only be investigating the language.
Con Custom commandline client
Exercism requires using a CLI utility to fetch and submit exercises. This is inconvenient compared to web-only alternatives, and poses an additional barrier to entry for some users.