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Asked: 2026-05-17T23:08:58+00:00

In scala, what is a good way to loop through a linked list(scala.collection.mutable.LinkedList) of

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In scala, what is a good way to loop through a linked list(scala.collection.mutable.LinkedList) of objects? For example, I want to have ‘for’ loop traverse through each object on the linked list and process it.

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  1. Editorial Team

    With foreach:

    Welcome to Scala version 2.8.0.final (Java HotSpot(TM) Client VM, Java 1.6.0_21).
Type in expressions to have them evaluated.
Type :help for more information.

scala> val ll = scala.collection.mutable.LinkedList[Int](1,2,3)
ll: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3)

scala> ll.foreach(i => println(i * 2))
2
4
6

    or, if your processing of each object returns a new value, use map:

    scala> ll.map(_ * 2)                  
res3: scala.collection.mutable.LinkedList[Int] = LinkedList(2, 4, 6)

    Some people prefer for comprehensions instead of foreach and map. They look like this:

    scala> for (i <- ll) println(i)
1
2
3

scala> for (i <- ll) yield i * 2
res5: scala.collection.mutable.LinkedList[Int] = LinkedList(2, 4, 6)
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