ReactJs

Exploring React Hooks: How to Use Them Effectively

Posted on by thuan 

      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

In this example, we’re using the useState Hook to add state to our Counter component. We’re initializing our state to 0 and creating a function called setCount that we can use to update our state.

When the user clicks the button, we call setCount with the new value of count, which causes our component to re-render with the updated state.

The useEffect Hook

The useEffect Hook allows you to add lifecycle methods to your functional components. Here’s an example:

javascript
import React, { useState, useEffect } from 'react';

function Counter() {
  const [count, setCount] = useState(0);

  useEffect(() => {
    document.title = `You clicked ${count} times`;
  }, [count]);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

In this example, we’re using the useEffect Hook to update the document title whenever our count state changes.

The useEffect Hook takes a function as its first argument. This function is called after every render of our component. We’re using it to update the document title with the current value of count.

The second argument to the useEffect Hook is an array of dependencies. If any of these dependencies change, the function is called again. In this case, we only want to update the document title when count changes, so we’re passing [count] as the second argument.

Other Hooks

In addition to the useState and useEffect Hooks, React provides several other Hooks that you can use to add functionality to your functional components:

  • useContext: allows you to access a Context from within a functional component
  • useReducer: allows you to use a reducer to manage complex state changes
  • useCallback: allows you to memoize a function so that it only changes when its dependencies change
  • useMemo: allows you to memoize a value so that it only changes when its dependencies change
  • useRef: allows you to create a mutable reference that persists across renders

Conclusion

React Hooks are a powerful and flexible way to add state and lifecycle methods to functional components. By using Hooks, you can make your code more modular and easier to work with. When using Hooks, it’s important to follow best practices and only update state when necessary.

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