Find the Missing Number in Array | JavaScript Coding Interview Question Explained Step-by-Step

🎯 Struggling with coding interview problems? In this video, we break down a **classic problem**: how to find the missing number in an array that contains all numbers from `0` to `n`, except one.

We’ll solve it using **JavaScript** with a clean and efficient approach — the **sum formula method**. Perfect for FAANG interviews, LeetCode prep, and JavaScript beginners!

🧠 Problem: Given an array of `n` distinct numbers from `0` to `n`, find the missing one.
📌 Example: [3, 0, 1] → Missing number = 2

✅ Topics Covered:
- Step-by-step logic
- JavaScript `reduce` method
- Sum formula trick
- Time and space complexity
- Coding interview tips

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