JavaScript Merge Sort Tutorial | Sort Array Without Built-in Functions | LeetCode Solution

Learn how to sort an integer array in ascending order using JavaScript Merge Sort without any built-in functions!
This tutorial demonstrates a LeetCode-friendly solution that achieves O(n log n) time complexity with minimal extra space. Perfect for coding interviews, competitive programming, and mastering sorting algorithms.

✅ Example:
Input: [5,2,3,1] → Output: [1,2,3,5]
Input: [5,1,1,2,0,0] → Output: [0,0,1,1,2,5]

💻 Code Highlights:

No built-in sort used

Efficient merge sort implementation

Works with negative and duplicate numbers

Ideal for LeetCode & HackerRank problems

Watch this video to master array sorting in JavaScript!


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