<span class="hljs-keyword">class</span> <span class="hljs-title class_">Car</span> <span class="hljs-keyword">extends</span> <span class="hljs-title class_ inherited__">Vehicle</span> {
  <span class="hljs-title function_">constructor</span>(<span class="hljs-params">speed, cost</span>) {
    <span class="hljs-variable language_">super</span>(speed);

    <span class="hljs-keyword">var</span> c = <span class="hljs-title class_">Symbol</span>(<span class="hljs-string">&#x27;cost&#x27;</span>);
    <span class="hljs-variable language_">this</span>[c] = cost;

    <span class="hljs-variable language_">this</span>.<span class="hljs-property">intro</span> = <span class="hljs-string">`This is a car runs at
      <span class="hljs-subst">${speed}</span>.`</span>;
  }
}
