Merge Sort for Linked Lists in JavaScript

Prerequisite: Merge Sort for Linked Lists

Merge sort is often preferred for sorting a linked list. The slow random-access performance of a linked list makes some other algorithms (such as quicksort) perform poorly, and others (such as heapsort) completely impossible.
In this post, Merge sort for linked list is implemented using JavaScript.

Examples:

Input : 5 -> 4 -> 3 -> 2 -> 1
Output :1 -> 2 -> 3 -> 4 -> 5

Input : 10 -> 20 -> 3 -> 2 -> 1
Output : 1 -> 2 -> 3 -> 10 -> 20

Output

10 -> 20 -> 3 -> 2 -> 1
After sorting : 1 -> 2 -> 3 -> 10 -> 20 


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