Frequency Counter Pattern in JavaScript — FASTEST Way to Compare Arrays!

In this video, we break down the Frequency Counter pattern in JavaScript, a powerful method to improve your code’s efficiency from O(n²) to O(n) and solving problems like comparing arrays without using nested loops. Learn how to optimise your code’s time complexity with clean, efficient logic.

You’ll learn:
✅ Why nested loops are inefficient
✅ How the Frequency Counter pattern works
✅ A step-by-step walkthrough of the optimised solution
✅ Real code examples explained clearly

Perfect for beginners and intermediate JavaScript learners who want to write cleaner, faster, and scalable code!

📁 Source Code:

📝 Blog Post:

Nested-loop video

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