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Is typeof faster than truthy tests?

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/dojo/1/dojo/dojo.xd.js"></script>
 

Preparation code output

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var o;
var r1 = typeof o !== "undefined";
var d = dojo;
var r2 = typeof d !== "undefined";
 

var o;
var r1 = !!o
var d = dojo;
var r2 = !!d;

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