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

You can

Iterator.continually{ some logic; blah }.takeWhile(condition)

to get pretty much the same thing. You'll need to use something mutable (e.g. a var) for the logic to impact the condition. Otherwise you can

Iterator.iterate((blah, whatever)){ case (_,w) => (blah, some logic on w) }.
         takeWhile(condition on _._2).
         map(_._1)