ScalaCollectionsFoldReduceFlat.scala

package PlayGround

object ScalaCollectionsFoldReduceFlat {

  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

  //foldreduce


  firstTen.find(_ > 4)               // Some(5)
  firstTen.fold(0)(_ + _)            // 55 // replace with sum
  firstTen.foldLeft(0)(_ - _)        // 55
  firstTen.foldRight(0)(_ - _)       // -5
  evens.forall(_ >= 2)               // true

  firstTen.reduce(_ + _)             // 55 replace with sum
  firstTen.reduceLeft(_ - _)         // -53
  firstTen.reduceRight(_ - _)        // Int = -5

  //flatten

  foo * 3                            // foofoofoo
  a.diff("foo")                      // " bar baz"

  names.flatten                      // List(A, l, C, h, r, i, s, t, i, n, a, K, i, m)
  names.flatMap(_.toUpperCase)       // List(A, L, C, H, R, I, S, T, I, N, A, K, I, M)

  a.foreach(println(_))              // prints one character per line
  a.foreach(println)                 // prints one character per line
  a.getBytes.foreach(println)        // prints the byte value of each character, one value per line

  firstTen.intersect(fiveToFifteen)  // List(5, 6, 7, 8, 9, 10)

  a.mkString(",")                    // f,o,o, ,b,a,r, ,b,a,z
  a.mkString("->", ",", "<-")        // ->f,o,o, ,b,a,r, ,b,a,z<-

  a.par                              // a parallel array, ParArray(f, o, o,  , b, a, r,  , b, a, z)

  a.replace('o', 'x')                // fxx bar baz
  a.replace("o", "x")                // fxx bar baz
  a.replaceAll("o", "x")             // fxx bar baz
  a.replaceFirst("o", "x")           // fxo bar baz
  firstTen.reverse                   // List(10, 9, 8, 7, 6, 5, 4, 3, 2, 1)

  a.sortWith(_ < _)                  // "  aabbfoorz"
  a.sortWith(_ > _)                  // "zroofbbaa  "
  a.sorted                           // "  aabbfoorz"

  evens.union(odds)                  // List(2, 4, 6, 1, 3, 5)
  Seq(1,2,3).updated(0,10)           // List(10, 2, 3)

  firstTen.view                      // scala.collection.SeqView[Int,List[Int]] = SeqView(...)

  firstTen.withFilter(_ > 5)                    // scala.collection.generic.FilterMonadic[Int,List[Int]]
  firstTen.withFilter(_ > 5).map(_ * 1)         // List[Int] = List(6, 7, 8, 9, 10)

  a.zip(0 to 10)                                // Vector((f,10), (o,11), (o,12), ( ,13), (b,14), (a,15), (r,16), ( ,17), (b,18), (a,19), (z,20))
  Seq(1,2,3).zipAll(Seq('a', 'b'), 0, 'z')      // List((1,a), (2,b), (3,z))
  Seq(1,2).zipAll(Seq('a', 'b', 'c'), 0, 'z')   // List((1,a), (2,b), (0,c))
  a.zipWithIndex                                // Vector((f,0), (o,1), (o,2), ( ,3), (b,4), (a,5), (r,6), ( ,7), (b,8), (a,9), (z,10))


}