4Clojure Easy Problems Updated on Clojurecademy
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Another thing that I found great for practice was Advent of Code[0]. The exercises are more challenging and most of them lend themselves really well to the conciseness and elegance of Clojure collections. The reddit community[1] is also helpful and even if you can't crack the algorithm, porting someone else's solution to Clojure is a valuable & fun exercise.
One of these people was Anthony Grimes (Raynes), who had prematurely passed away last year. I take this moment to reflect on his memory.
"Now solve this without using the standard way of solving it." doesn't seem like a good idea when you want people to write good readable code in the end :/