Various codewars solutions.
From https://github.com/Codewars/codewars.com/wiki/About-Codewars:
Codewars is a community of developers, who are called Code Warriors (or just warriors), that train on improving their development skills. Think of it like a coding dojo - where developers train with each other and help each other get better through practice.
[...]
Every time you complete a challenge (which we call "kata") you will be shown the solutions that others came up with.
[...]
Codewars is built around the idea that we should be testing code using real testing frameworks. We don't feed STDIN data to your code and expect you to send specific values (in a certain order) to STDOUT to be validated. You write real methods, classes and objects that return values and get tested the same as you would your code on your own projects.