Exercism is a coding challenge website that offers 3100+ challenges spanning 52 different programming languages. After picking a language that you'd like to master, you tackle the coding challenges right on your machine (Exercism has their own command line interface that you can download from GitHub).
It is a bit different from other challenge websites, however, because you work with a mentor after completing each challenge. The mentor reviews your answers online and helps you improve them if needed. Once your answers have been approved and submitted, you unlock more challenges.
source: https://www.slant.co/topics/2497/~best-coding-challenge-sites
recentness: 2020-10
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Top Pro
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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. See More
Top Con
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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. See More
IndustriousRaedieahkka's Experience
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Specs
Languages:Ballerina, Bash, C, C#, C++, Clojure, CoffeeScript, Common Lisp, Crystal, Delphi Pascal, Elixir, Elm, Emacs Lisp, Erlang, F#, Go, Haskell, Java, JavaScript, Kotlin, Lua, Objective-C, Ocaml, OK, Perl 5, Perl 6, Nim, PHP, PL/SQL, PureScript, Python, R, Racket, Ruby, Rust, Scala, Scheme, Swift, TypeScript
Features:Exercises
Top Pro
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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. See More
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Get it here](http://exercism.io/)
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