It's not unlike most other code challenge websites (leetcode, etc.) but a few things that I like about it:
tool/language agnostic: I've been switching between solving in Go, Python, and Common Lisp. I can use whatever tools, languages, or libraries I want. Similar to project Euler but less focused on "just math".
simple input, simple output: I can decide if I want the input hardcoded in source, read in as an argument or read from a file
examples given: I solve most problems using real TDD
choice of problems: some of the problems are simple, almost cute, purely relaxing. Others teach me entirely new algorithms
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I've been going through past years of adventofcode.com/
It's not unlike most other code challenge websites (leetcode, etc.) but a few things that I like about it: