F%3F%0A%7D">Try</a></pre></p>
<p>JavaScript also allows accessing properties which aren't present:
<pre class="typescript-code"><span class="tm-kw">const</span> <span class="tm-vr">obj</span> = { <span class="tm-vr">width:</span> <span class="tm-num">10</span>, <span class="tm-vr">height:</span> <span class="tm-num">15</span> };
<span class="tm-cmt">// Why is this NaN? Spelling is hard!</span>
<span class="tm-kw">const</span> <span class="tm-vr">area</span> = <span class="tm-vr">obj</span>.<span class="tm-v