Doubly-linked list/Traversal
You are encouraged to solve this task according to the task description, using any language you may know.
Traverse from the beginning of a doubly-linked list to the end, and from the end to the beginning.
JavaScript
See Doubly-Linked_List_(element)#JavaScript. The traverse() and print() functions have been inherited from Singly-Linked_List_(traversal)#JavaScript.
<lang javascript>DoublyLinkedList.prototype.getTail = function() {
var tail;
this.traverse(function(node){tail = node;});
return tail;
} DoublyLinkedList.prototype.traverseBackward = function(func) {
func(this);
if (this.prev() != null)
this.prev().traverseBackward(func);
} DoublyLinkedList.prototype.printBackward = function() {
this.traverseBackward( function(node) {print(node.value())} );
}
var head = createDoublyLinkedListFromArray([10,20,30,40]); head.print(); head.getTail().printBackward();</lang>
outputs:
10 20 30 40 40 30 20 10
Uses the print() function from Rhino or SpiderMonkey.