My solutions to Advent of Code 2018 puzzles.

Stuff I learned

I learn by comparing my solutions with other people's code after submitting.

• Day 01:
  • Use clojure.core/reduced to break out and return immediate value when reducing.
• Day 02:
  • Use clojure.core/frequencies to get number of appearances of distinct items in coll.
  • Another idea is to use (clojure.core/group-by identity) and then perform count.
  • Get differences in two collections with clojure.data/diff - it returns items only in A, items only in B and items in both.
  • for list comprehension is usually more readable than nested loops/recurs. Also great for doing combinations, e.g. (for [i xs j xs :when i < j] ...)
  • Use destructuring, it can greatly improve readability.