react js components code example

Example 1: class in react

class App extends Component {
    constructor() {
        super()
        this.state = {
            name: "Sally",
            age: 13
        }
    }
    
    render() {
        return (
            

                
{this.state.name}
                
{this.state.age} years old
            
        )    
    }
}

Example 2: create react component class

class MyComponent extends React.Component{
    constructor(props){
        super(props);
    };
    render(){
        return(
            

              

              	My First React Component!
              
            
        );
    }
};

Example 3: class app extends component syntax

class Welcome extends React.Component {
  render() {
    return 
Hello, {this.props.name}
;
  }
}

Example 4: functional component react

function Welcome(props) {
  return 
Hello, {props.name}
;
}

function App() {
  return (
    

                      
  );
}

ReactDOM.render(
  ,
  document.getElementById('root')
);

Example 5: create functional component react

import React from 'react'; const App = () => {  const greeting = 'Hello Function Component!';   return ;}; const Headline = ({ value }) =>  
{value}
; export default App;

Example 6: React Components

class Car extends React.Component {
  render() {
    return 
Hi, I am a Car!
;
  }
}