Some of the Katas have a pretty obvious purpose - do some efficient sorting, undertand bits, etc. Others seem very arbitrary and obscure to me. https://www.codewars.com/kata/56b5afb4ed1f6d5fb0000991 is one such example. Mechanically I'm sure I can figure out how to do that, but what I'm wondering is why is it valuable to figure out?

The more of these I do, the more it seems like some sort of context or value statement would be helpful rather than just assuming it is self-evident.