Here you can find some solutions for the differn Excercism tracks. Exercism practice problems have, as any coding problem, infinite solutions. Some better than othrs. These are mine. This is just intended to share with anybody interseted in discovering a different way of solving a problem, some might be better than yours and others might be worst. Feel free to comment and suggest changes.
In general if there are multiple solutions for a problem, the higher iteration should have the better solution.