Basic Collection Operations

In this example I show some common operations that can be performed on all collections. The examples use list but any Iterable can be used.

1. scala> val list = List(1,2,3,4)
2. list: List[Int] = List(1, 2, 3, 4)
4. scala> list.mkString(",")
5. res0: String = 1,2,3,4
7. scala> list.mkString("(",",",")")
8. res1: String = (1,2,3,4)
10. scala> list.reduceLeft ( (next,cumulative) => cumulative + next )
11. res2: Int = 10
13. scala> for( e <- list ) println ( e ) 
14. 1 2 3 4  
16. scala> for( e <- list ) {      
17.      | println ( e )      
18.      | } 
19. 1 2 3 4  
21. scala> for( e <- list ) yield e+1 
22. res5: List[Int] = List(2, 3, 4, 5)  
24. scala> for ( e <- list; if( e % 2 == 0 ) ) yield e 
25. res6: List[Int] = List(2, 4)