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

In your case (line = reader.readNext()) is a functional literal that returns type Unit. You may rewrite the code as follows:

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