scala while loop assignment

Question

I'm trying to port some Java code into Scala:

while ((j=f('blah'))>=0) ...

ERROR:"value >= is not a member of Unit"

Is this not possible?

If you really need that, you're doin it rong... – Landei Mar 04 '13 at 09:36 — Landei, Mar 04 '13 at 09:36

score 23 · Accepted Answer · answered Mar 03 '13 at 23:20

23

Assignments return () (unit) in Scala. But that's okay because you can put a code block anywhere. You need this instead:

while ({ j=f("blah"); j } >= 0) ...

answered Mar 03 '13 at 23:20

Rex Kerr

7

The reasoning for that can be found here: [What is the motivation for Scala assignment evaluating to Unit rather than the value assigned?](http://stackoverflow.com/questions/1998724/what-is-the-motivation-for-scala-assignment-evaluating-to-unit-rather-than-the-v) – EECOLOR Mar 03 '13 at 23:23

1 Answers1