Logo

Developer learning path

News
React

Understanding Components Lifecycle in React

Introduction to React
What is React? Advantages of React JSX syntax Setting up the development environment
Components and Props
Components in React Functional Components Class Components Props PropTypes and defaultProps Component composition
State and Lifecycle Methods
State in React setState method Lifecycle Methods in Class Components Conditional Rendering based on the state
Handling Events
Event handling in React Binding Event Handlers Passing Arguments to Event Handlers Conditional Event Handling
Forms and User Input
Forms in React Controlled Components Uncontrolled Components Form Validation
Lists and Keys
Rendering Lists in React Keys Extracting Components with Keys
Components Lifecycle
Understanding Components Lifecycle Mounting, Updating and Unmounting Lifecycle Methods
Working with APIs
Making HTTP Requests with Axios Handling Responses with Promises Asyncawait syntax for making API calls
React Router
What is React Router? Installation Configuring Routes Navigating between pages using Link and NavLink components
Redux State Management
What is Redux Three principles of Redux Redux Store, Actions, and Reducers ReactRedux integration
Styling React Applications
Styling in React Inline styles CSS Modules Styled Components
Testing React Applications
Testing Fundamentals Testing React Components Integration Testing Using Jest and React Testing Library
Deployment and Optimization
Deployment options for React applications Performance Optimization Code Splitting React Lazy and Suspense
Next Steps
Advanced Topics Resources for continued learning Conclusion

Understanding Components Lifecycle

56

#description

React components have a lifecycle, which refers to the various stages that a component goes through from its birth (mounting) through to its death (unmounting). Understanding these stages is essential because they provide you with the necessary hooks to execute code at specific times in the component's lifecycle.

There are three main stages in a component's lifecycle:
  1. Mounting: This is the first stage of a component's lifecycle, in which the component is created and inserted into the DOM.

In this stage, the following methods can be executed:
  • constructor()
  • getDerivedStateFromProps()
  • componentWillMount() (deprecated)
  • render()
  • componentDidMount()
  1. Updating: This stage begins when a component is updated after initialization. Any change in the state or props will trigger this stage.

In this stage, the following methods can be executed:
  • getDerivedStateFromProps()
  • shouldComponentUpdate()
  • componentWillUpdate() (deprecated)
  • render()
  • getSnapshotBeforeUpdate()
  • componentDidUpdate()
  1. Unmounting: This is the final stage of a component's lifecycle, in which the component is removed from the DOM.

In this stage, the following methods can be executed:
  • componentWillUnmount()

By understanding these stages and the methods that can be executed at each of them, you can write more efficient and effective React components that behave as intended throughout their lifecycle.

March 25, 2023

If you don't quite understand a paragraph in the lecture, just click on it and you can ask questions about it.

If you don't understand the whole question, click on the buttons below to get a new version of the explanation, practical examples, or to critique the question itself.