2722. Join Two Arrays by ID | JavaScript Object Merge 🔗

Welcome to Day 23 of the 30 Days of JavaScript challenge! 📆

Today we solve “Join Two Arrays by ID” — merge two arrays of objects based on their id key 🧩

📌 What You’ll Learn:
✅ How to combine arrays using a unique identifier
✅ Using spread syntax to merge objects
✅ Avoiding duplicate entries using a map-like object

🔗 LeetCode Problem:
https://leetcode.com/problems/join-two-arrays-by-id

💡 Real-world use case: Merging API data responses by user ID or record ID.

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