How I Built a Reactive State System in Pure JavaScript

📰 Dev.to · Saiful Siam

Learn how to build a reactive state system in pure JavaScript and improve your application's performance and scalability

intermediate Published 14 Jun 2026
Action Steps
  1. Create a store to hold the application's state using JavaScript objects
  2. Implement a subscription system to notify components of state changes
  3. Use the Observer pattern to decouple components from the state management system
  4. Build a dispatcher to handle actions and update the state accordingly
  5. Test the reactive state system with a simple application
  6. Optimize the system for performance and scalability
Who Needs to Know This

Software engineers and frontend developers can benefit from this knowledge to build more efficient and responsive applications

Key Insight

💡 A reactive state system can simplify state management and improve application performance by reducing unnecessary re-renders

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🚀 Build a reactive state system in pure JavaScript and take your app's performance to the next level! 💻

Key Takeaways

Learn how to build a reactive state system in pure JavaScript and improve your application's performance and scalability

Full Article

When I started building Levelo JS, one of the most interesting challenges was creating a reactive...
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