Scala Unit type

Question

I use opencsv to parse csv files, and my code is

while( (line = reader.readNext()) != null ) { .... }

I got a compiler warning saying:

Answer 1

Assignment in Scala doesn't return a value, Unit is similar to void in C or C++.

try

var line = ""

while ({line = reader.readNext(); line != null}) { ... }

This works because the value of the last expression in a block is returned and in this case it is a Boolean which is required by the while