eter">person<span class="token punctuation">,</span> index<span class="token punctuation">,</span> self</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> person<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'isHappy'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuat