I would be really grateful if you could help me with the details. I am really confused about this assignment. And please don't copy other answers to here.

Instructions: Implement a mergesort in the Ruby programming language. Your function should be named mergesort and should take as a parameter a single array. It should return the sorted array. You may need to define other functions to implement this. Use recursion. Your program must ask the user for numeric values. If you use a fixed-length array, then allow for ten items, otherwise allow the user to input a sentinel value of -1 to end input