Scala Collections: map and filter

Scala's standard collections are immutable by default. map builds a new list by applying a function to every element, and filter keeps only the elements for which a condition is true. Neither changes the original list.

object Main {
  def main(args: Array[String]): Unit = {
    val scores = List(82, 91, 76)
    val curved = scores.map(s => s + 5)
    println(curved)
    println(curved.filter(s => s >= 90).sum)
  }
}