Example 1: conditional rendering react

function Mailbox(props) {
  const unreadMessages = props.unreadMessages;
  return (
    

      
Hello!
      {unreadMessages.length > 0 &&        
          You have {unreadMessages.length} unread messages.        
      }    
  );
}

const messages = ['React', 'Re: React', 'Re:Re: React'];
ReactDOM.render(
  ,
  document.getElementById('root')
);

Example 2: conditional rendering react

import React, { Component } from 'react';

// @params [] * denotes optional param (we will need to use conditional rendering for some of these)
// [type](Bulma CSS class): Hero type, focuses on the base styling
// size(Bulma CSS Class): The size of the hero, small, medium, large, etc...
// heading: The main heading
// [subheading]: The subheading if desired
// [alignment](Bulma CSS Class): Aligns the content horizontally

// This Simple HeroComponent is bases upon the following
// https://bulma.io/documentation/layout/hero/ 

export class HeroComponent extends Component
{
	render() {
		return (
          	// The following ternary simply applies a class if it has been specified
			

				

                  	// Again, another ternary applying a class... blah blah blah....
					

						
{this.props.heading}
						// So, to answer the question...
						// The following is one way to do conditional rendering, probably the simplest and cleanest
						// If this.props.subheading exists, render 

						{this.props.subheading && 
{this.props.subheading}
}
					
				
			
		)
	}
}