NEW 133924
Bracket access is significantly slower than property access 
https://bugs.webkit.org/show_bug.cgi?id=133924
Summary Bracket access is significantly slower than property access
Ryosuke Niwa
Reported 2014-06-14 23:05:59 PDT
Created attachment 233135 [details] Microbenchmark function getByVal(object, property) { return object[property]; } function getById(object) { return object.myProperty; } The first function appears to be ~3.5x slower than the second function even if getByVal is always called as getByVal(object, 'myProperty'). It's only 1.5x slower on Chrome 35 and 2.2x slower on Firefox 30.
Attachments
Microbenchmark (1.03 KB, text/html)
2014-06-14 23:05 PDT, Ryosuke Niwa 		no flags
Details
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Ryosuke Niwa
Comment 1 2014-06-14 23:07:14 PDT
Note that it's 3.7x slower in the shipping Safari so it has gotten better.
Ryosuke Niwa
Comment 2 2014-06-14 23:07:27 PDT
(In reply to comment #1) > Note that it's 3.7x slower in the shipping Safari so it has gotten better. 4.7x*
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