LeetCode 56: Merge Intervals | JavaScript Clean Solution

In this video, I solve LeetCode 56: Merge Intervals using an efficient JavaScript approach.

The goal is to merge all overlapping intervals in a list of interval pairs.

My approach first sorts the intervals by their start time, then iterates once to merge any overlaps by comparing the current interval with the last one in the output. This gives us an efficient O(n log n) time solution.

I’ll walk through how the merging logic works step by step and explain the common mistakes to avoid, especially when handling edge cases.

What You’ll Learn:
✅ Why sorting first makes the merge easier
✅ How to compare intervals to detect overlap
✅ When to merge vs when to push
✅ Time and space complexity breakdown

Chapters:
0:00 - Problem Overview
1:30 - Explanation
6:30 - Code Solution
10:10 - Time & Space Complexity

💬 Want to see how this applies to meeting rooms, calendar bookings, or ranges in arrays? Let me know in the comments!

#leetcode #mergeintervals #javascript #leetcode56 #intervalproblems #sorting #codinginterview #algorithms #datastructures #intervalmerge #bigO