ex.scala

object Example {
  def main(args: Array[String]): Unit = {
    println("Scala!")

    // create some values to use
    // TERM: assignment
    val a = 1
    val b = 2
    val c = 3
    val d = 4
    val e = 5

    // total the numbers
    // TERM: operation, operators, expression
    val total = a + b + c + d + e

    // variable to indicate if we should print the total
    val should_print_total = true

    // output the total (if the variable is set)
    // TERM: interpolation, conditional, boolean, control flow
    if (should_print_total) {
      println(s"The total is $total")
    }

    // output the total if it is equal to
    if (total == 15) {
      println("The total was 15 just like we wanted")
    }

    // create a list of numbers
    // TERM: list
    val list = List(a, b, c, d, e)

    // how many numbers do we have?
    // TERM: method, interpolation
    println(s"There are ${list.size} numbers in the list")

    // output each number
    // TERM: iteration, interpolation, view, zip, match
    list.view.zipWithIndex.foreach {
      case (number: Int, index: Int) =>
        println(s"The number $number is at index $index in the list")
    }

    // are the numbers even or odd?
    // TERM: function, map
    def is_even(n: Int): Boolean = (n % 2) == 0

    list.map { (n: Int) =>
      if (is_even(n)) s"$n is even" else s"$n is odd"
    }.foreach(println)

    // is there a quicker way to get the total? in this language?
    // TERM: fold, method, interpolation
    println(s"The total is ${list.fold(0)(_ + _)}")
  }
}