ScalaCollectionsSortGroup.scala

package PlayGround

object ScalaCollectionsSortGroup {

  val evens = List(2,4,6)
  val odds = List(1,3,5)
  val a = "foo bar baz"
  val foo = "foo"
  val bar = "bar"
  val names = List("Al","Chistina","Kim")
  val firstTen = (1 to 10).toList
  val fiveToFifteen = (5 to 15).toList

  //Sorting

  //a.sortBy             // this is a bit long; see below
  a.sortWith(_ < _)    // "  aabbfoorz"
  a.sortWith(_ > _)    // "zroofbbaa  "
  a.sorted             // "  aabbfoorz"

  case class Person(firstName: String, lastName: String)

  val fred = Person("Fred", "Flintstone")
  val wilma = Person("Wilma", "Flintstone")
  val barney = Person("Barney", "Rubble")
  val betty = Person("Betty", "Rubble")

  val people = List(betty, wilma, barney, fred)

  people.sortBy(n => (n.lastName, n.firstName))
  people.sortBy(n => (n.firstName))

  //Grouping methods

  firstTen.groupBy(_ > 5)         // Map(false -> List(1, 2, 3, 4, 5), true -> List(6, 7, 8, 9, 10))
  firstTen.grouped(2)             // Iterator[List[Int]] = non-empty iterator
  firstTen.grouped(2).toList      // List(List(1, 2), List(3, 4), List(5, 6), List(7, 8), List(9, 10))
  firstTen.grouped(5).toList      // List(List(1, 2, 3, 4, 5), List(6, 7, 8, 9, 10))

  a.partition(_ > 'e')            // (foorz, " ba ba")  // a Tuple2
  firstTen.partition(_ > 5)       // (List(6, 7, 8, 9, 10),List(1, 2, 3, 4, 5))

  firstTen.sliding(2)             // Iterator[List[Int]] = non-empty iterator
  firstTen.sliding(2).toList      // List(List(1, 2), List(2, 3), List(3, 4), List(4, 5), List(5, 6), List(6, 7), List(7, 8), List(8, 9), List(9, 10))
  firstTen.sliding(4).toList      // List(List(1, 2, 3, 4), List(2, 3, 4, 5), List(3, 4, 5, 6), List(4, 5, 6, 7), List(5, 6, 7, 8), List(6, 7, 8, 9), List(7, 8, 9, 10))
  firstTen.sliding(2,2).toList    // List(List(1, 2), List(3, 4), List(5, 6), List(7, 8), List(9, 10))
  firstTen.sliding(2,3).toList    // List(List(1, 2), List(4, 5), List(7, 8), List(10))
  firstTen.sliding(2,4).toList    // List(List(1, 2), List(5, 6), List(9, 10))

  firstTen.span(_ < 5)            // (List(1, 2, 3, 4),List(5, 6, 7, 8, 9, 10))
  a.split(" ")             // Array(foo, bar, baz)
  a.splitAt(3)                    // (foo," bar baz")




}