line-numbers"><code class="javascript language-javascript"><span class="token comment">// This won't work:</span>
<span class="token function-variable function">fullNameDidChange</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</s