Scala solution for the algorithm explained in https://en.wikipedia.org/wiki/Look-and-say_sequence. But in this soluition, letter comes first, count comes after that.

LookAndSay.scala

package hackoranko

object LookAndSay {
    
    def LookAndSay(start: String, n: Int): String = {

        var first = start(0)
        var tmpStart = new StringBuilder(start(0).toString() + "1")

        for (t <- start.tail) {
            if (first.equals(t)) {
                tmpStart(tmpStart.size - 1) = (tmpStart.last.toInt + 1).toChar
            } else {
                tmpStart.append(t + "1")
            }
            first = t
        }

        if ((n - 1) == 0) {
            tmpStart.toString()
        } else {
            LookAndSay(tmpStart.toString(), n - 1)
        }

    }

    def main(args: Array[String]) {

        val start = "1"
        val cycle = 6

        println("Result: " + LookAndSay(start, cycle)) // -> 12221131

    }
}