How do I pattern match arrays in Scala?

Question

My method definition looks as follows

def processLine(tokens: Array[String]) = tokens match { // ...

Suppose I wish to know whether the sec

Answer 1

Pattern matching may not be the right choice for your example. You can simply do:

if( tokens(1) == "" ) {
  println("empty")
}

Pattern matching is more approriate for cases like:

for( t <- tokens ) t match {
   case "" => println( "Empty" )
   case s => println( "Value: " + s )
}

which print something for each token.

Edit: if you want to check if there exist any token which is an empty string, you can also try:

if( tokens.exists( _ == "" ) ) {
  println("Found empty token")
}