#DON’T do this in REACT

When working with React, there are certain things that you should avoid doing in order to maintain a clean codebase and ensure that your application runs smoothly. Below are some things that you should avoid doing in React:

Using setState in componentDidMount

It is not recommended to use setState inside the componentDidMount lifecycle method. This can lead to performance issues and potential side effects. Instead, you should initialize your state in the constructor or use the new static getDerivedStateFromProps method introduced in React 16.3.

Direct DOM manipulation

One of the main benefits of using React is its virtual DOM, which allows for efficient updates and rendering. Directly manipulating the DOM can cause conflicts with React’s internal state management and lead to unexpected behavior. Instead, you should use React’s state and props to manage your application’s UI.

Not using keys in dynamic lists

When rendering dynamic lists in React, it is important to provide a unique key for each item. This helps React efficiently track and update the items in the list. If you don’t provide keys, React will have to re-render the entire list every time there is a change, which can lead to performance issues.

Using setState in a loop

Using setState in a loop can lead to unnecessary re-renders and performance issues. It is better to batch state updates using functional updates or by combining multiple state changes into a single setState call.

Not using shouldComponentUpdate

By default, React will re-render a component whenever its state or props change. This can lead to unnecessary re-renders and performance issues, especially for large and complex components. Implementing the shouldComponentUpdate method can help optimize your components by preventing unnecessary re-renders.

By following best practices and avoiding these common pitfalls, you can ensure that your React application runs smoothly and efficiently.