arrays - Error: Not found: Value S (Scala) - 


val array(k,s) = readline.split(" ").map(_.toint)

this code works fine. not this:

val array(k,s) = readline.split(" ").map(_.toint)

capitalizing "s" here gives me error: error: not found: value s

what going on?

when creating k , s identifiers val array(k,s) = ..., using pattern matching define them.

from scala specifications (1.1 identifiers):

the rules pattern matching further distinguish between variable identifiers, start lower case letter, , constant identifiers, not.

that is, when val array(k,s) = ..., you're matching s against constant. since have no s defined, scala reports error: not found: value s.

note scala throw matcherror if constant defined still cannot find match :

scala> val s = 3 s: int = 3  scala> val array(k, s) = array(1, 3) k: int = 1  scala> val array(k, s) = array(1, 4) scala.matcherror: [i@813ab53 (of class [i)   ... 33 elided

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