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JavaScript Interview Notes & Concepts

Welcome to your comprehensive JavaScript interview notes! This repository contains in-depth guides, code examples, and explanations for key JavaScript topics, designed to help you ace interviews and master advanced JS concepts.


📚 Table of Contents


🔥 Highlights

  • Functions: Function statements, expressions, anonymous/named functions, arrow functions, first-class functions, arguments vs parameters, and more.
  • Closures: Deep dive into closures, interview Q&A, practical use-cases, memory leaks, and common pitfalls.
  • Event Loop: Complete guide to the JS event loop, call stack, microtasks/macrotasks, code outputs, and best practices.
  • Higher Order Functions: Explanation, examples, passing functions as arguments, returning functions, and built-in HOFs like map, filter, and reduce.
  • Map, Reduce, Filter: Detailed explanations, polyfills, key concepts, and mental models for understanding these powerful array methods.
  • Polyfills: What they are, why they matter, and how to implement polyfills for map, filter, and reduce.

📝 How to Use

  • Browse each topic's folder for detailed markdown notes and code examples.
  • Use the Table of Contents above or navigate folders directly.
  • Practice with the code snippets to reinforce your understanding.

📖 Index


⭐ Contributing

Contributions are welcome! If you'd like to improve these notes or add new topics, please follow these steps:

How to Contribute

  1. Fork this repository to your own GitHub account.
  2. Clone your fork to your local machine:
    git clone https://github.com/your-username/your-repo-name.git
  3. Create a new branch for your feature or fix:
    git checkout -b my-feature-branch
  4. Make your changes (add notes, fix typos, improve explanations, etc.).
  5. Commit and push your changes:
    git add .
    git commit -m "Describe your changes"
    git push origin my-feature-branch
  6. Open a Pull Request on GitHub from your branch to the main branch of this repo.
  7. Wait for review and feedback.

Contribution Guidelines

  • Please keep explanations clear and concise.
  • Use code blocks for code examples.
  • Add references or links if you use external sources.
  • Be respectful and constructive in your feedback and reviews.

Thank you for helping make these notes better for everyone!

🌟 Like these notes?

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License

MIT