python's hasattr in javascript?
<p>in javascript:</p>

<pre><code>d={one: false, two: true}
d.one
d.two
d.three
</code></pre>

<p>I want to be able to differentiate between <code>d.one</code> and <code>d.three</code>. By default they both evaluate to false, but in my case they should not be treated the same.</p>
