When comparing JavaScript For Cats vs exercism.org, the Slant community recommends exercism.org for most people. In the question“What are the best resources to learn JavaScript?” exercism.org is ranked 3rd while JavaScript For Cats is ranked 29th. 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 Beginner-friendly
JavaScript For Cats starts by explaining what is a programming language and builds on from there.
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 It's just a starting point
JavaScript for Cats is a quick introduction to programming, designed to get you acquainted with the basics in the quickest way possible. It is not, however, an in-depth resource that will make you ready to develop production-ready web applications.
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.