Input

function HelloWorld({greeting = "hello", greeted = '"World"', silent = false, onMouseOver,}) {

  if(!greeting){return null};

      // TODO: Don't use random in render
  let num = Math.floor (Math.random() * 1E+7).toString().replace(/.d+/ig, "")

  return <div className='HelloWorld' title={`You are visitor number ${ num }`} onMouseOver={onMouseOver}>

    <strong>{ greeting.slice( 0, 1 ).toUpperCase() + greeting.slice(1).toLowerCase() }</strong>
    {greeting.endsWith(",") ? " " : <span style={{color: 'grey'}}>", "</span> }
    <em>
  { greeted }
    </em>
    { (silent)
      ? "."
      : "!"}

    </div>;
}