react function to add component to screen code example

Example 1: react function being called every minute

componentDidMount() {
  this.interval = setInterval(() => this.setState({ time: Date.now() }), 1000);
}
componentWillUnmount() {
  clearInterval(this.interval);
}

Example 2: 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
      
    
  );
}