Scala学习（一）

 Scala练习

object Demo01 {

def main(args: Array[String]): Unit = {

val lst0 = List(1,7,9,8,0,3,5,4,6,2)

val arr = lst0.toArray

val arr1 = for (e <- arr) yield e*10

val lst1 = arr1.toList

val arr2 = arr.filter(_ % 2 == 0)

val lst2 = arr2.toList

val lst3 = lst0.sortWith( (x,y) => x < y)

val lst4 = lst0.reverse

val lst5 = lst0.grouped(4)

val lst6 = lst5.toList

val lst7 = lst6.flatten

val lines = List("hello tom hello jerry", "hello jerry", "hello kitty")

val lst8 = lines.map( (line:String) => line.split(" ")).flatten

val par = lst0.par

val parSum = par.sum

val parSum2 = par.reduce( _ + _)

val sum2 = lst0.reduce( (x,y) => x + y)

val lst9 = lst0.fold(0)((x,y) => x + y)

val lst10 = lst0.foldLeft(0)((x,y) => x + y)

val l1 = List(3,5,6,4,7)

val l2 = List(1,2,3,4,5)

val set1 = l1.toSet

val set2 = l2.toSet

println(set1.union(set2))

println(set1.intersect(set2))

println(set1.diff(set2))

}

}