Life cycle in class component

In React, a component’s lifecycle refers to the various stages that a component goes through from its initialization to its removal from the DOM. Understanding the component lifecycle is crucial for front-end developers working with React, as it allows them to better control and optimize the performance of their components.

In this post, we will discuss the component lifecycle in both class components and function components.

Class Components

In class components, the component lifecycle is divided into three main phases:

1. Initialization: This phase occurs when a component is first created and initialized. During this phase, the component’s constructor method is called, and the component’s state is initialized.

2. Mounting: During the mounting phase, the component is rendered to the DOM for the first time. This phase includes three methods:

componentWillMount: This method is called just before the component is rendered to the DOM for the first time. It is a good place to perform any setup or initialization tasks that need to happen before the component is rendered.

render: This method is called to render the component to the DOM. It is the only required method in a class component, and it should return a JSX element or null.

componentDidMount: This method is called just after the component is rendered to the DOM for the first time. It is a good place to perform any additional setup or initialization tasks that need to happen after the component is rendered, such as making API calls or setting up event listeners.

3. Updating: During the updating phase, the component’s state or props change, causing the component to re-render. This phase includes three methods:

componentWillReceiveProps: This method is called just before the component receives new props. It is a good place to perform any tasks that need to happen when the component receives new props, such as updating the component’s state based on the new props.

shouldComponentUpdate: This method is called just before the component is re-rendered due to a change in state or props. It allows the developer to control whether or not the component should be re-rendered based on the current state and props.

componentWillUpdate: This method is called just before the component is re-rendered due to a change in state or props. It is a good place to perform any tasks that need to happen just before the component is re-rendered, such as updating the DOM or making API calls.

render: This method is called to re-render the component. It is the only required method in a class component, and it should return a JSX element or null.

componentDidUpdate: This method is called just after the component is re-rendered due to a change in state or props. It is a good place to perform any tasks that need to happen after the component is re-rendered, such as updating the DOM or making API calls.

4. Unmounting: During the unmounting phase, the component is removed from the DOM. This phase includes one method: componentWillUnmount: This method is called just before the component is removed from the DOM. It is a good place to perform any cleanup tasks that need to happen before the component is removed, such as removing event listeners or canceling API calls.

Function Components

Function components, which were introduced in React 16.8, do not have a lifecycle in the same way that class components do. Instead, they have a single render method that is called whenever the component’s state or props change.

However, function components do have access to a few lifecycle-like methods called

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