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takayahilton/count.scala

Created November 9, 2020 07:14
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count.scala
import cats.implicits._
import cats.data._
List("a", "b", "b", "c", "b").traverse(s => State((map: Map[String, Int]) => map.get(s) match {
case Some(i) => (map.updated(s, i + 1), s + s"${i + 1}")
case None => (map.updated(s, 0), s)
})).run(Map.empty).value._2 //List("a", "b", "b1", "c", "b2")
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