Peter Neyens questions

Peter Neyens answers

• Scala : exclude some Dates
• Cats Seq[Xor[A,B]] => Xor[A, Seq[B]]
• Turn list of key/value pairs into list of values per key in spark
• Use of ordering to sort array of arrays, ascending and descending
• How to compose two different `State Monad`?
• Scala Array Slicing with Tuple
• Creating a type class instance for a sealed trait
• Using different monads in for-comprehension
• Why does a for-comprehension used with an extractor of type tuple result in a compile warning on `filter`?
• How to use the free monad with Future[M[_]]