Update linked_list.js #780
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Key Improvements: tail pointer: Speeds up add() from O(n) to O(1). Helper function getNodeAt(index): Reduces duplicate traversal logic. Fixed edge cases for head and tail management. More efficient printList() using an array instead of string concatenation.
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Key Improvements:
tail pointer: Speeds up add() from O(n) to O(1).
Helper function getNodeAt(index): Reduces duplicate traversal logic. Fixed edge cases for head and tail management.
More efficient printList() using an array instead of string concatenation.