README.md

MERN-Stack

MERN STACK TUTORIAL

M 🠪 MongoDB

E 🠪 ExpressJS

R 🠪 ReactJS

N 🠪 NodeJS

React Cheat-Sheet

1. Lifecycle Hoocks, Context, HOC, PropTypes
2. React Hooks
3. Redux & Redux Async API Call

componentDidCatch(error, info)

If sometime failed to render a component (ErrorBoundary)(^16. React):

import React, { component } from 'react';
  
 class ErrorBoundary extends Component {
    state = {
      hasError: false,
      errorMessage: ''
    }
    
    componentDidCatch = (error, info) => {
        this.setState({hasError: true, errorMessage: error});
    }
    
    
    
    render() {
      if (this.state.hasError) {
        return <h1>{this.state.errorMessage}</h1>;
      } else {
        return this.props.children;
      }
    }
 } 
 
 export default ErrorBoundary;

Component Lifecycle (Only available in Class-based Components!)

• 1. constructor(props)
• 2. getDerivedStateFromProps(props, state)
• 3. getSnapshotBeforeUpdate(prevProps, prevState)
• 4. componentDidCatch()
• 5. componentWillUnmount()
• 6. shouldComponentUpdate(nextProps, nextState)
• 7. componentDidUpdate()
• 8. componentDidMount()
• 9. render()
• 1 --> 2 --> 9 --> 8
• Component Lifecycle - Update 2 --> 6 --> 9 --> 3 --> 7