Scala underspecified types -

i have following spark code snippet .

but following error:

:8: error: missing parameter type.

which happens here:

       val index:int= col1(i) ; tokened +=splitted(index) + " " ;  } }                       ^ 

i can't work out steps seems i've specified properties. need return string method string => string (currently it's string -> unit) first time ever coding in scala apologies if stupid question

line => { var col1:array[int] = array(1,2) ; var tokened:string = "" ;      var splitted:array[string]=line.split(" ") ;       (i<- 0 col1.length) {          val index:int= col1(i);          tokened +=splitted(index) + " " ;       }  }  

i guess need:

(line: string) => { /* missing type annotation */   var col1:array[int] = array(1,2)   var tokened:string = ""   var splitted:array[string]=line.split(" ")    (i<- 0 col1.length) {      val index:int= col1(i)     tokened += splitted(index) + " "   }    tokened /* return value */ } 

in order make function type explicit, store anonymous function in function-typed variable:

val f: (string => string) = line => { ... }