List Filtering: https://www.codewars.com/kata/53dbd5315a3c69eed20002dd/train/javascript
Array.diff: https://www.codewars.com/kata/523f5d21c841566fde000009/train/javascript
Simple Pig Latin: https://www.codewars.com/kata/520b9d2ad5c005041100000f/train/javascript