Matching on tuple using comparison operator

Question

I would like to match on tuple pattern, but I can not find any solution how to match using comparison operators. My code is:

myTuple  match {       
      case (-1,-1,true) => ...       
      case (_>=0,-1,_) =>  ...
    }

This gives give compile time error. I also tried to use if guard, but as I see it can not be applied this way:

 case (_ if _>=0,-1,_) =>  ...

Is my approach correct or should I solve this on an different way? Thanks Zoltan

Answer 1

The syntax is wrong, you should use guard as follows:

myTuple  match {       
  case (-1,-1,true) => ...
  case (x,-1,_) if x >= 0 =>  ...
  case _ => ... // default
}

There are a lot of good introduction to scala pattern matching on the web. Here is the first detailed one, I've found on google: Playing with Scala's pattern matching