Comments on: JavaScript Perfromance Tip- Don’t Test Against obj.length. Test Against a Local Variable. http://htmlcssjavascript.com/javascript/javascript-perfromance-tip-dont-test-against-obj-length-test-against-a-local-variable/ Not a Ninja, Pirate or Jedi. Tue, 31 Jan 2012 11:08:26 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: The JavaScript NodeList and You. Watch Where You Point That Thing, Soldier » HTML + CSS + JavaScript » Blog Archive http://htmlcssjavascript.com/javascript/javascript-perfromance-tip-dont-test-against-obj-length-test-against-a-local-variable/#comment-127 The JavaScript NodeList and You. Watch Where You Point That Thing, Soldier » HTML + CSS + JavaScript » Blog Archive Tue, 03 Nov 2009 21:52:28 +0000 http://htmlcssjavascript.com/?p=200#comment-127 [...] I wrote about the performance issue previously. The basic gist is that with a DOM method that returns a NodeList the lookup is performed every time it’s referenced. So even if you assigned it to a variable, you’re not actually saving anything- it still has to examine the document every time. That’s expensive. [...] [...] I wrote about the performance issue previously. The basic gist is that with a DOM method that returns a NodeList the lookup is performed every time it’s referenced. So even if you assigned it to a variable, you’re not actually saving anything- it still has to examine the document every time. That’s expensive. [...]

]]> By: Rob Larsen http://htmlcssjavascript.com/javascript/javascript-perfromance-tip-dont-test-against-obj-length-test-against-a-local-variable/#comment-58 Rob Larsen Thu, 03 Sep 2009 12:03:26 +0000 http://htmlcssjavascript.com/?p=200#comment-58 That's a great page. The <code>i--</code> stuff is interesting to me. maybe another post? I feel like that idea needs a little more explaining since it's reversing a deeply ingrained pattern. I know about it and I have trouble remembering to try it. That’s a great page. The i-- stuff is interesting to me. maybe another post? I feel like that idea needs a little more explaining since it’s reversing a deeply ingrained pattern. I know about it and I have trouble remembering to try it.

]]> By: jdbartlett http://htmlcssjavascript.com/javascript/javascript-perfromance-tip-dont-test-against-obj-length-test-against-a-local-variable/#comment-56 jdbartlett Thu, 03 Sep 2009 04:10:31 +0000 http://htmlcssjavascript.com/?p=200#comment-56 lies! what you should do is "var i = temporary.length; while(i--)" :p http://www.devpro.it/examples/loopsbench/ lies! what you should do is “var i = temporary.length; while(i–)” :p

http://www.devpro.it/examples/loopsbench/

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