A recursive palindrome function. Needs to be case insensitive.

palindrome.scala

import scala.collection.immutable.StringOps._

@annotation.tailrec
def isPalindrome(strSeq : IndexedSeq[Char]) : Boolean = strSeq match {
  case _ if strSeq.size < 2 => true
  case _ if strSeq.take(1) == strSeq.takeRight(1) => isPalindrome(strSeq.slice(1, strSeq.size-1))
  case _ => false
}