May a while loop be used with yield in scala

Question

Here is the standard format for a for/yield in scala: notice it expects a collection - whose elements drive the iteration.

for (blah <- blahs) yield someThi         


        

Answer 1

Using for comprehensions is the wrong thing for that. What you describe is generally done by unfold, though that method is not present in Scala's standard library. You can find it in Scalaz, though.