在while循环的条件下分配给变量 - scala

Question

I Java I can write this:

Matcher m;
while ((m = pattern.matcher(string)).matches()) {...}

How would I do this in Scala? This doesn't work :

var m: Matcher = null
while ((m = pattern.matcher(s)).matches()) {}

Answer 1

Assignments return Unit in Scala, but it's ok to use code blocks like this:

while ({
  val m = pattern.matcher(s)
  m.matches
}) { ... }