props and state in react js code example

Example 1: state and props

What is the Props
Props is short for properties and they are used to pass data between React components. React’s data flow between components is uni-directional
wt is State
which allows components to create and manage their own data

Example 2: state with react functions

class Example extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  render() {
    return (
      

        
You clicked {this.state.count} times
         this.setState({ count: this.state.count + 1 })}>
          Click me
        
      
    );
  }
}

Example 3: how to define state in react function

import React, { useState } from 'react';

function Example() {
  // Declare a new state variable, which we'll call "count" 
  const [count, setCount] = useState(0);
  return (
    

      
You clicked {count} times
       setCount(count + 1)}>
        Click me
      
    
  );
}

Example 4: props and state react

function tick() {
  const element = (
    

      
Hello, world!
      
It is {new Date().toLocaleTimeString()}.
    
  );
  ReactDOM.render(    element,    document.getElementById('root')  );}

setInterval(tick, 1000);