React useUpdate Hook

Introduction

In this lab, we will explore the use of the useUpdate hook in React. This hook allows us to force a component to re-render when called, which can be useful for updating the UI with new data or changes. By the end of this lab, you will have a better understanding of how to implement this hook in your React projects to improve the performance and functionality of your applications.

Skills Graph

React useUpdate Hook

index.html and script.js have already been provided in the VM. In general, you only need to add code to script.js and style.css.

To force a component to re-render when called, use the useReducer() hook to create a new object every time it's updated and return its dispatch. Here is an example implementation of useUpdate() function:

const useUpdate = () => {
  const [, update] = React.useReducer(() => ({}));
  return update;
};

You can then use useUpdate() in your component to trigger a re-render when necessary:

const MyApp = () => {
  const update = useUpdate();

  return (
    <>
      <div>Time: {Date.now()}</div>
      <button onClick={update}>Update</button>
    </>
  );
};

ReactDOM.createRoot(document.getElementById("root")).render(<MyApp />);

Please click on 'Go Live' in the bottom right corner to run the web service on port 8080. Then, you can refresh the Web 8080 Tab to preview the web page.

Summary

Congratulations! You have completed the React useUpdate Hook lab. You can practice more labs in LabEx to improve your skills.