When comparing Scala for the Impatient vs exercism.org, the Slant community recommends exercism.org for most people. In the question“What are the best resources to learn Scala?” exercism.org is ranked 1st while Scala for the Impatient 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 Focuses on teaching the language
Many Scala books aim to teach not just the language, but programming theory as well. "Scala for the Impatient" focuses only on teaching the syntax and features of Scala, making it a great option for experienced programmers looking to pick up the language quickly.
Pro Easy to read and concise introduction to Scala
For experienced developers, this book will quickly get you running with Scala.
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 Author takes a Java-centric approach to many topics
If you aren't arriving at Scala with a Java background, some of the examples may seem unnecessarily focused on OOP inheritance relationships and core Java libraries.
Con Unreadable source code on Kindle
In order to view a properly formatted version of the code, the reader has to click a link which takes them to the index. It is then extremely difficult for the reader to find their original place in the book and continue reading.
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.