Get index of current element in a foreach method of Traversable?

Question

Suppose I have two arrays:

val ar1 = Array[String](\"1\", \"2\", \"3\")
val ar2 = Array[String](\"1\", \"2\", \"3\", \"4\")

Now for each e

Answer 1

This is how you loop with an index in idiomatic Scala:

scala> List("A", "B", "C").zipWithIndex foreach { case(el, i) =>
     |   println(i + ": " + el)
     | }
0: A
1: B
2: C

And here is the idiomatic Scala way to do what you are trying to achieve in your code:

scala> val arr1 = Array("1", "2", "3")
arr1: Array[java.lang.String] = Array(1, 2, 3)

scala> val arr2 = Array("1", "2", "3", "4")
arr2: Array[java.lang.String] = Array(1, 2, 3, 4)

scala> (arr1, arr2).zipped.map(_ + _) foreach println
11
22
33