HackerRank Problem Solution: let and constant | Hacker rank let and constant problem solution | code

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# 🚀 HackerRank Problem Solution: `let` and `const` | JavaScript ES6 Explained!

🔥 **Welcome to another exciting coding tutorial!** In this video, we dive deep into solving the **"let and const"** problem on **HackerRank**, a fundamental concept for JavaScript developers working with ES6+.

📌 **What You’ll Learn in This Video:**
✅ Understanding the difference between `let`, `const`, and `var`
✅ How `let` prevents re-declaration errors
✅ Why `const` is used for immutable values
✅ The importance of block-scoping in JavaScript
✅ Step-by-step breakdown of the **HackerRank "let and const"** problem
✅ Common mistakes and best practices

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⏳ **Timestamps**
0:00 - Introduction
1:15 - Problem statement overview
3:45 - Explanation of `let` and `const` in ES6
7:30 - Implementing the solution
12:00 - Debugging and testing the code
15:20 - Submitting on HackerRank
17:00 - Summary and best practices

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📜 **Problem Statement (HackerRank)**
The challenge requires us to correctly use **let and const** while handling a given mathematical formula for computing the area and perimeter of a rectangle.

🔗 **Challenge Link**: [Insert HackerRank problem URL here]

👨‍💻 **Solution Code:**
```javascript
function main() {
const PI = Math.PI;
let r = readLine();

}
```

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📢 **Why `let` and `const` Matter in Modern JavaScript?**
With the introduction of ES6, JavaScript evolved to provide better ways of handling variables:
🔹 `var` has function scope (prone to hoisting issues)
🔹 `let` provides block scope, preventing unintended overwrites
🔹 `const` is perfect for values that should not change

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🎯 **Who Should Watch This Video?**
🔹 Beginner JavaScript developers
🔹 Anyone preparing for **HackerRank**, **LeetCode**, or **CodeSignal**
🔹 Web developers learning ES6+ best practices
🔹 Coding interview aspirants

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**YouTube Tags:**
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