What are all the uses of an underscore in Scala?

Question

I\'ve taken a look at the list of surveys taken on scala-lang.org and noticed a curious question: \"Can you name all the uses of “_”?\". Can you? If yes, please do so here.

Answer 1

Here are some more examples where _ is used:

val nums = List(1,2,3,4,5,6,7,8,9,10)

nums filter (_ % 2 == 0)

nums reduce (_ + _)

nums.exists(_ > 5)

nums.takeWhile(_ < 8)

In all above examples one underscore represents an element in the list (for reduce the first underscore represents the accumulator)