ror conditional rendering code example

Example 1: conditional props react

// single prop
propName={ condition ? something : somethingElse }
propName={ condition && something }
// multiple props
{ ...( condition ? { ...setOfProps } : { ...setOfOtherProps })}
{ ...( condition && { ...setOfProps })}

Example 2: conditional rendering react

function Mailbox(props) {
  const unreadMessages = props.unreadMessages;
  return (
    <div>
      <h1>Hello!</h1>
      {unreadMessages.length > 0 &&        <h2>          You have {unreadMessages.length} unread messages.        </h2>      }    </div>
  );
}

const messages = ['React', 'Re: React', 'Re:Re: React'];
ReactDOM.render(
  <Mailbox unreadMessages={messages} />,
  document.getElementById('root')
);