Capitalization and Mutability : https://www.codewars.com/kata/595970246c9b8fa0a8000086/train/javascript
Get the integers between two numbers : https://www.codewars.com/kata/598057c8d95a04f33f00004e/train/javascript
Array plus array : https://www.codewars.com/kata/5a2be17aee1aaefe2a000151/train/javascript