Mapping methods in List : map(), flatMap(), foreach()

scala> //Mapping methods in List

scala>

scala> // map() #357, #366
scala> // Note : range() is a method available in
scala> //        Companion Object 'List'
scala> val data = List.range(1, 5)
data: List[Int] = List(1, 2, 3, 4)

scala> val res = data.map(_ + 1)
res: List[Int] = List(2, 3, 4, 5)

scala>

scala> // flatMap()

scala> val data = List("This is", "an example")
data: List[String] = List(This is, an example)

scala> val res = data.map(_.split(" "))
res: List[Array[String]] = List(Array(This, is), Array(an, example))

scala> val res = data.flatMap(_.split(" "))
res: List[String] = List(This, is, an, example)

scala>

scala> //foreach() : Takes a procedure as an argument #359

scala> val data = List.range(1, 5)
data: List[Int] = List(1, 2, 3, 4)

scala> var sum = 0
sum: Int = 0

scala> val res = data.foreach{ x =>
     |     sum = sum + x
     | }

scala> sum
res24: Int = 10