I wonder, why can't I compile this one:
class MyClass{
override def toString = "123:" + if (true) "456" else "789"
//error: illegal start of simple expression
}
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2 Answers
Try this:
override def toString = "123:" + (if (true) "456" else "789")
2 Comments
som-snytt
It was useful to me when I realized that "simple expression" is in contrast to "expr": github.com/scala/scala-dist/blob/master/documentation/src/… It clarifies similar questions like why can't I
(Console println throw new RuntimeException).
pedrofurla
Yeah, there a few precedence issues regarding these expressions. Check this out docs.scala-lang.org/sips/pending/uncluttering-control.html, maybe in the near future...
pedrofurla is right. With your expression the compiler tries to mix the string with the if and fails. Using parenthesis you eliminate ambiguity in your expressions.
class MyClass{
override def toString = "123:" + (if (true) "456" else "789")
}
I found this simple online service where you can test your scala expressions: http://www.simplyscala.com/
