"But in fact, in the end result the Scala collection libraries are actually unique, nobody, no other language has a library like that, where you say you have a rich set of collection types, a rich set of collection operations, in particular bulk operations, that take function parameters like Map, Filter, Flat Map, these sort of things and you have the uniform return type principle which says that every operation can be applied on a collection and yields the value of the same collection as a result. So if you apply a map to a set, you get a set, if you apply a map to a sequence, you get a sequence. "

Anyone knows how Scala's collections compares to C#'s linq?