chapter_7_Exercise

val flightsDatabase = List(
  ("Geneva", "Vienna", 200),
  ("Vienna", "London", 150),
  ("London", "Geneva", 300),
  ("Geneva", "Zurich", 100),
  ("Vienna", "London", 300),
  ("Vienna", "Helsinki", 200)
)

//1. Exercise: Find all the flights arriving to London.

  println(flightsDatabase.filter(f => f._2 == "London"))

//2. Exercise: given a val numbers = List(1, 2, 3, 4), use the map function to make a new list where each number is squared.

val numbers = List(1, 2, 3, 4)
val squareNumber = numbers.map(n => n*n)
println(squareNumber)

//**why did we get a nested list?
    Because of we get a new list for connecting flight. For creating new list from the original list there created the nested list.

//3. Exercise: use foreach to print every pair of connecting flights nicely, so that the end user of your search engine doesn't see the parentheses or the List.

flightsDatabase.foreach(f=>println(s"Deptutare : ${f._1}; Arrival : ${f._2}; Cost : ${f._3}"))