an class="token punctuation">)</span><span class="token punctuation">;</span>

person<span class="token punctuation">.</span>hasDirtyAttributes<span class="token punctuation">;</span> <span class="token comment">// => false</span>
person<span class="token punctuation">.</span>isAdmin<span class="token punctuation">;</span> <span class="token comment">// => false</span>
person<span class="token punctuation">.</span><span class="token function">changedAttributes</span><span class="token punctuation">(</span><