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  1. object Main extends App {
  2.  
  3.   val l = List("A", "A", "C", "C", "B", "C")
  4.  
  5.   def appendCount(li: List[String]): List[String] = {
  6.     val counts = l.foldLeft(Map[String, Int]())((acc, e) => acc + (e -> (acc.getOrElse(e, -1) + 1)))
  7.     val (appendedList, _) = l.foldRight(List[String](), counts){ case (e, (li, m)) =>
  8.       (s"$e${m(e)}" :: li, m + (e -> (m(e) - 1)))
  9.     }
  10.     appendedList
  11.   }
  12.  
  13.   println(appendCount(l))
  14. }
Success #stdin #stdout 0.4s 4382720KB
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Standard input is empty
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List(A0, A1, C0, C1, B0, C2)
https://ideone.com/jMau9Q
language:
Scala (scala 2.12.8)
created:
8 years ago
visibility:
public

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