Scala - can 'for-yield' clause yields nothing for some condition?

Question

In Scala language, I want to write a function that yields odd numbers within a given range. The function prints some log when iterating even numbers. The first version of the fu

Answer 1

I don't think this can be done easily with a for comprehension. But you could use partition.

def getOffs(N:Int) = {
  val (evens, odds) =  0 until N partition { x => x % 2 == 0 } 
  evens foreach { x => println("skipping " + x) }
  odds
}

EDIT: To avoid printing the log messages after the partitioning is done, you can change the first line of the method like this:

val (evens, odds) = (0 until N).view.partition { x => x % 2 == 0 }