- The need to write a pattern matching decomposition when mapping over a sequence of tuples is inconvenient.
- Consider you have a list of pairs:
val pairs = List(1, 2, 3).zipWithIndex
// pairs: List[(Int, Int)] = List((1,0), (2,1), (3,2))
- Imagine you want to map
pairs to a list of Ints so that each pair of numbers is mapped to their sum.
- The best way to do this in Scala 2 is with a pattern matching anonymous function
pairs map {
case (x, y) => x + y
}
// res1: List[Int] = List(1, 3, 5)
- Scala 3 now allows us to write:
pairs map ((x, y) => x + y)
// val res0: List[Int] = List(1, 3, 5)
pairs.map(_ + _)
// val res1: List[Int] = List(1, 3, 5)
- In this exercise we will use parameter untupling
- Make sure you're positioned at exercise "parameter untupling"
- Follow the exercise instructions provided in the README.md file in the code folder