Advanced use of Scala list

an introduction

Introduce some higher-order functions of List

 

two code

1. C:\Users\lenovo>scala
2. Welcome to Scala2.12.1(JavaHotSpot(TM)64-BitServer VM,Java1.8.0_101).
3. Typein expressions for evaluation.Ortry:help.
5. scala> val l =List(1,2,3)
6. l:List[Int]=List(1,2,3)
8. scala> l.filter(x=>x%2==1)
9. res0:List[Int]=List(1,3)
11. scala>"99 Red Balloons".toList
12. res1:List[Char]=List(9,9,, R, e, d,, B, a, l, l, o, o, n, s)
14. scala>"99 Red Balloons".toList.filter(x=>Character.isDigit(x))
15. res2:List[Char]=List(9,9)
17. scala>"99 Red Balloons".toList.takeWhile(x=>x!='B')
18. res3:List[Char]=List(9,9,, R, e, d,)