Javascript big-O property access performance
<p>What are the performance characteristics of JavaScript property access (on current implementations)?</p>

<ul>
<li>Is it safe to assume array access is O(1)?</li>
<li><p>If I use an object as a hash table (with string keys) can I safely assume O(1) or O(log n) access time?</p></li>
<li><p>Are there any common browsers or environments that are significantly faster/slower than the others and that I should keep an eye for?</p></li>
<li><p>Do the JavaScript standards have anything to say?</p></li>
</ul>

<p>And most importantly:</p>

<ul>
<li>Where can I find good references for this kind of asymptotic JavaScript performance issues?</li>
</ul>
