LeetCode 349: Intersection of Two Arrays | JavaScript Solution
In this video, I solve LeetCode 349: Intersection of Two Arrays using an efficient JavaScript solution with Set().
The task is to find the unique common elements between two arrays.
I use two Sets:
One to track all elements from the first array
Another to store common elements found in the second array
This ensures that we return only unique results with O(n + m) time complexity.
Time Complexity: O(n + m) — where n and m are lengths of nums1 and nums2
Space Complexity: O(n + m) — for the sets
What You'll Learn:
✅ How to use Set() to remove duplicates
✅ How to find intersections efficiently
✅ Time and space optimization with JS built-ins
Chapters:
0:00 - Problem Breakdown
0:50 - Set Strategy Explanation
2:25 - JavaScript Code Walkthrough
4:00 - Time & Space Complexity
💬 Want to see the version using sorting + two pointers? Comment below!
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