Lee questions

Lee answers

• GroupBy and Sum
• Concatenating result sets
• Why these functions have different types in Haskell?
• Combining lists in linq
• Incorrect data in Constructor
• clojure iteratively destructure array of strings
• Count occurrence of an element in Haskell list and return max sequence
• Restricting type parameter to Monoid
• How to re-ask for input in try catch statement
• Pre-made delegates for operators?