Doubly-linked list/Traversal: Difference between revisions

=={{header|Wren}}==

{{libheader|Wren-llist}}

{{libheader|Wren-fmt}}

<lang ecmascript>import "/llist" for DLinkedList

import "/fmt" for Fmt

// create a new doubly-linked list and add the first 50 positive integers to it

var dll = DLinkedList.new(1..50)

// traverse the doubly-linked list from head to tail

for (i in dll) {

Fmt.write("$4d ", i)

if (i % 10 == 0) System.print()

}

System.print()

// traverse the doubly-linked list from tail to head

for (i in dll.reversed) {

Fmt.write("$4d ", i)

if (i % 10 == 1) System.print()

}</lang>

{{out}}

<pre>

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48 49 50

50 49 48 47 46 45 44 43 42 41

40 39 38 37 36 35 34 33 32 31

30 29 28 27 26 25 24 23 22 21

20 19 18 17 16 15 14 13 12 11

10 9 8 7 6 5 4 3 2 1

</pre>