_ _
_ __ ___ __ | | _____ | | __ _ _ __ __ _ ___
| ' _ \ / _ | |/ / _ / _| ' \ / | '_ \ / _ |/ _
| | | | | | (| | < / (| | | | (| | | | | (| | __/
|| || ||_,||__|_|| ||_,|| ||_, |_|
|_/
Javascript solution to classic interview problem