🧠 LeetCode 30 Days of JavaScript Challenge

Welcome to the LeetCode 30 Days of JavaScript Challenge! This repository contains my solutions to the daily JavaScript coding problems from the LeetCode 30 Days of JavaScript Challenge. The goal of this challenge is to sharpen JavaScript skills by solving a variety of problems focused on JavaScript-specific concepts.

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📚 Table of Contents

• About the Challenge
• Daily Progress
• How to Use This Repository
• Technologies Used
• Resources
• License

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🧠 About the Challenge

The 30 Days of JavaScript challenge by LeetCode is designed to help developers improve their understanding of JavaScript fundamentals, such as:

• Functions & Closures
• Asynchronous JavaScript (Promises, async/await)
• Event Loop & Concurrency
• Object-Oriented Programming
• Array/Object manipulation
• DOM manipulation (where applicable)

Each day presents a new challenge to solve using JavaScript.

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✅ 30 Days of JavaScript – Daily Progress

Day	Problem Title	LeetCode URL	Solution	Difficulty
1	Create Hello World Function	Link	Solution	Easy
2	Counter	Link	Solution	Easy
3	Counter II	Link	Solution	Easy
4	To Be or Not To Be	Link	Solution	Easy
5	Basic Array Transformations	Link	Solution	Easy
6	Array Reduce Transformation	Link	Solution	Easy
7	Array Prototype Last	Link	Solution	Easy
8	Array Wrapper	Link	Solution	Easy
9	Group By	Link	Solution	Medium
10	Join Two Arrays by ID	Link	Solution	Medium
11	Sleep	Link	Solution	Easy
12	Promise Time Limit	Link	Solution	Easy
13	Cache With Time Limit	Link	Solution	Medium
14	Debounce	Link	Solution	Medium
15	JSON: Is Object Empty	Link	Solution	Easy
16	Chunk Array	Link	Solution	Easy
17	Flatten Deeply Nested Array	Link	Solution	Medium
18	Compact Object	Link	Solution	Medium
19	Classes	Link	Solution	Medium
20	Event Emitter	Link	Solution	Medium
21	Array Wrapper	Link	Solution	Easy
22	Calculator with Method Chaining	Link	Solution	Easy
23	Allow One Function Call	Link	Solution	Easy
24	Memoize	Link	Solution	Medium
25	Function Composition	Link	Solution	Easy
26	Sleep Sort	Link	Solution	Easy
27	Sort By	Link	Solution	Easy
28	Snail Traversal	Link	Solution	Medium
29	Deep Comparison	Link	Solution	Hard
30	Partial Function	Link	Solution	Medium

🚀 How to Use This Repository

1. Clone the repository:

https://github.com/SecurityTalent/30-Days-of-JavaScript-challenges

🛠 Technologies Used

• JavaScript (ES6+) – All challenges are solved using modern JavaScript syntax.
• Node.js – Used to run and test JavaScript files locally.
• LeetCode – Challenge problems are sourced from LeetCode’s 30 Days of JavaScript Study Plan.
• VS Code / Any Code Editor – For writing and managing code efficiently.
• Git – Version control for tracking changes and collaborating.
• Markdown – For formatting this README file.

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📚 Resources

• 📘 LeetCode 30 Days of JavaScript Challenge
• 📚 MDN Web Docs – JavaScript
• 📘 JavaScript Info
• 📗 Node.js Documentation
• 📖 ECMAScript 6 Features
• 🧪 Jest (optional) – For unit testing

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📝 License

This project is licensed under the MIT License.

You are free to use, modify, and distribute this project for personal or commercial purposes.
Please give credit by linking back to this repository if you find it helpful.