function App () {

  const isLoading = false // rewrite to true

  return (

    <div>

      This content is always shown

      <br />

      {isLoading ? <Loader /> : <UserCard />}

    </div>

  )

}

​

function Loader () {

  return (<React.Fragment>Loading...</React.Fragment>)

}

​

function UserCard () {

  return (

    <div className="card">

      <div className="card-content">

        Lorem ipsum

      </div>

    </div>

  )

}