2625. Flatten Deeply Nested Array | JavaScript Recursion Mastery 🔁

Welcome to Day 26 of the 30 Days of JavaScript challenge! 📆

Today we tackle “Flatten Deeply Nested Array” — a recursive dive into multi-level arrays 🧬

📌 What You’ll Learn
✅ How recursion helps with deeply nested data
✅ Using Array.isArray() to detect nested arrays
✅ Controlling flattening depth with a counter
✅ Clean and readable base case handling

🔗 LeetCode Problem:
https://leetcode.com/problems/flatten-deeply-nested-array

💡 Real-world use case: Handling nested JSON data from APIs, formatting data for frontend display.

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