</span> <span class="token keyword">class</span> <span class="token class-name">Title</span> <span class="token keyword">extends</span> <span class="token class-name">Helper</span> <span class="token punctuation">{</span>
  original <span class="token operator">=</span> document<span class="token punctuation">.</span>title<span class="token punctuation">;</span>

  <span class="token function">compute</span><span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation"