Iterating Map Entries

Visit each key and value in a map.

MapEntries.scala

object Main {
  def main(args: Array[String]): Unit = {
    val bonus = 
    val prices = Map("pad" -> 5, "pen" -> 2, "ink" -> 8)
    var total = 0
    for ((k, v) <- prices) {
      total = total + v + bonus
    }

    println("entries=" + prices.size)
    println("total=" + total)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val bonus = 
    val prices = Map("pad" -> 5, "pen" -> 2, "ink" -> 8)
    var total = 0
    for ((k, v) <- prices) {
      total = total + v + bonus
    }

    println("entries=" + prices.size)
    println("total=" + total)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val bonus = 
    val prices = Map("pad" -> 5, "pen" -> 2, "ink" -> 8)
    var total = 0
    for ((k, v) <- prices) {
      total = total + v + bonus
    }

    println("entries=" + prices.size)
    println("total=" + total)
  }
}

map-entries A `for` over a map binds each entry to a key and value. Summing the values gives one scalar result regardless of entry order.