Question

How to extract the unique integers from a list excluding duplicates in Scala

Answer 1

object UniqueExcludeDuplicates {
  def getUniqueExcludeDuplicates(lst: List[Int]): List[Int] = {
    // Map to count occurrences of each number
    val frequency = lst.groupBy(identity).view.mapValues(_.size).toMap

    // Collect numbers that appear only once
    lst.filter(num => frequency(num) == 1)
  }

  def main(args: Array[String]): Unit = {
    val lst = List(1, 2, 3, 5, 8, 3, 1, 1, 0, 6, 5, 7, 3, 1, 4, 9)

    // Call the function to exclude duplicates
    val uniqueValues = getUniqueExcludeDuplicates(lst)

    println(s"Unique values (excluding duplicates): ${uniqueValues.mkString(" ")}")
  }
}

  
     
/*
run:
  
Unique values (excluding duplicates): 2 8 0 6 7 4 9

*/

 

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