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];
}
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
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.