React Lifecycle Methods in Class Components

?? Mastering React Lifecycle Methods in Class Components! ??

If you're diving into React and working with class components, understanding lifecycle methods is a game-changer! ?? These methods help you control what happens at different stages of a component's life, making your apps more efficient and dynamic.

Lifecycle Methods of React Components are defined as a series of methods that are invoked in different stages of the component’s existence. React web apps are actually a collection of independent components that run according to the interactions made with them. Every React Component has a lifecycle of its own.

A component's lifecycle has three main phases: the Mounting Phase, the Updating Phase, and the Unmounting Phase.

1. Mounting Phase

The Mounting phase is when a React component is created and inserted into the DOM for the first time. It involves the following lifecycle methods:

• constructor(props):
• static getDerivedStateFromProps(props, state):
• render():
• componentDidMount():

2. Updating Phase

The Updating phase occurs whenever a component is re-rendered due to changes in state or props. This phase consists of several lifecycle methods that allow you to manage component behavior during updates:

• static getDerivedStateFromProps(props, state):
• shouldComponentUpdate(nextProps, nextState):
• render():
• getSnapshotBeforeUpdate(prevProps, prevState):
• componentDidUpdate(prevProps, prevState, snapshot):

3. Unmounting Phase

The Unmounting phase occurs when a component is removed from the DOM. There is only one lifecycle method in this phase:

• componentWillUnmount():

Example -

Summary of Phases

1. Mounting: The component is created and inserted into the DOM. Key methods: constructor, getDerivedStateFromProps, render, componentDidMount.
2. Updating: The component is re-rendered due to changes in props or state. Key methods: getDerivedStateFromProps, shouldComponentUpdate, render, getSnapshotBeforeUpdate, componentDidUpdate.
3. Unmounting: The component is removed from the DOM. Key method: componentWillUnmount.

Understanding these phases and their respective lifecycle methods allows you to manage your component's behavior more effectively, optimize performance, and handle side effects efficiently.