DEV Community

Nadim Chowdhury
Nadim Chowdhury

Posted on • Edited on

How to create useState hook in vanilla JavaScript?

To create a simplified version of the useState hook from React in vanilla JavaScript, you can leverage closures and JavaScript object destructuring. Here's a basic implementation:

function useState(initialValue) {
  // Initialize the state variable with the provided initial value
  let state = initialValue;

  // Define a function to update the state
  function setState(newState) {
    state = newState;
    // Trigger re-rendering of the component (not implemented in this example)
    render();
  }

  // Return an array containing the current state and the function to update it
  return [state, setState];
}
Enter fullscreen mode Exit fullscreen mode

Here's how you can use this custom useState hook:

// Usage example
const [count, setCount] = useState(0);

// Increment the count
setCount(count + 1);

// Log the current state
console.log(count); // Output: 1
Enter fullscreen mode Exit fullscreen mode

This useState implementation is simplified and lacks some features and optimizations present in React's useState hook, such as batching updates, lazy initialization, and preservation of state between re-renders. Additionally, it doesn't handle asynchronous updates or support functional updates (using a function as an argument to update the state based on the previous state). However, it demonstrates the basic idea of how you can create a simple state management hook in vanilla JavaScript.

Support My Work โค๏ธ

If you enjoy my content and find it valuable, consider supporting me by buying me a coffee. Your support helps me continue creating and sharing useful resources. Thank you!

Connect with Me ๐ŸŒ

Letโ€™s stay connected! You can follow me or reach out on these platforms:

๐Ÿ”น YouTube โ€“ Tutorials, insights & tech content

๐Ÿ”น LinkedIn โ€“ Professional updates & networking

๐Ÿ”น GitHub โ€“ My open-source projects & contributions

๐Ÿ”น Instagram โ€“ Behind-the-scenes & personal updates

๐Ÿ”น X (formerly Twitter) โ€“ Quick thoughts & tech discussions

Iโ€™d love to hear from youโ€”whether itโ€™s feedback, collaboration ideas, or just a friendly hello!

Disclaimer

This content has been generated with the assistance of AI. While I strive for accuracy and quality, please verify critical information independently.

Top comments (0)