Component Lifecycle in React

The lifecycle of a component refers to the different stages a component goes through during its existence. This lifecycle is particularly important for class components, while functional components use hooks to replicate similar behaviors.

🧠 Class Component Lifecycle Methods:

1. Mounting: When the component is created and added to the DOM.
   • constructor(): Initializes state and binds methods.
   • componentDidMount(): Called after the component is added to the DOM.
2. Updating: Happens when props or state change.
   • shouldComponentUpdate(): Determines if a re-render is necessary.
   • componentDidUpdate(): Called after the component is updated in the DOM.
3. Unmounting: When the component is removed from the DOM.
   • componentWillUnmount(): Used to clean up before the component is destroyed.

🧠 Using Hooks for Lifecycle in Functional Components:

• useEffect(): In functional components, useEffect() replaces most lifecycle methods like componentDidMount and componentDidUpdate.

• It runs code after the component renders, similar to how lifecycle methods work in class components.

In short:

• Class components use lifecycle methods for handling side effects and managing component state.
• Functional components use useEffect() for similar tasks, offering a more concise and flexible solution for handling side effects.