Apply, loop and reductions
Day 02: Inventory Management System
Frequencies, sets and list comprehension (for loop)
Day 03: No Matter How You Slice It
Discovering magic of reduce, update and some syntactic sugars
Day 04: Repose Record
Parsing with regexes, loops with hash-maps; TDDed
Day 05: Alchemical Reduction
Peek and pop: building a simple queue