Is there a better way for this matching?

[TS]

I have an array:

var arg = condColumnsKeys

with the elements

arg: Array[String] = Array(LOT_PREFIX, PS_NAME_BOOK_TEMPLATE_NAME, PS_NAME_PAGE_NAME, PS_NAME_FIELD_NAME)

Desired outcome is to get the string "LOT_PREFIX" and store it in var ccLotPrefix

My first attempt is

var arg = condColumnsKeys
var ccLotPrefix =
  arg match {
   case "L_PREFIX" => "L_PREFIX"
   case "LOT_PREFIX" => "LOT_PREFIX"
   case _=> "LOT_PREFIX"
 }

But I get a type mismatch as it needs to match with Array[String]

command-4310537:4: error: type mismatch;
 found   : String("L_PREFIX")
 required: Array[String]
   case "L_PREFIX" => "L_PREFIX"
        ^

So my idea is to pack it into a for loop?

var j = (r.findAllIn(condValues).count(_ == "!"))
var arg = condColumnsKeys
for(j<-(0).to(j)) {
  var ccLotPrefix =
  arg match {
   case "L_PREFIX" => "L_PREFIX"
   case "LOT_PREFIX" => "LOT_PREFIX"
   case _=> "LOT_PREFIX"
 }
}

But I still don't get rid of the type mismatch. So, after some trial/error this can be achieved by

for(i<-(0).to(i)) {
  if (arg(i) == "LOT_PREFIX")
   ccLotPrefix = "LOT_PREFIX"
  else if (arg(i) == "L_PREFIX")
   ccLotPrefix = "L_PREFIX"
}
println(ccLotPrefix)

LOT_PREFIX

But is there a better way to achieve this? Because, obviously, you don't always know what's inside the array....