How to use the hasNext() and hasPrevious() method for the `smart-list` Linked List module for Node

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I am using singly-linked-list to manage my in-out transactions but singly-linked-list is not provided hasPrevious() method.

Why I need hasPrevious() method ?

In some conditions I want to iterate linked list twice in same method signature check here

So I moved to smart-list which is provided hasPrevious() but I could not make this work. See example

Can anyone please suggest me how to use hasNext() and hasPrevious() in smart-list or any other solution?

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