I've been looking at the source code of my.class.js to find out what makes it so fast on Firefox. Here's the snippet of code used to create a class:  my.Class = function () {     var len = arguments.length;     var body = arguments[len - 1];...
Just wrote up some test cases in jsperf to test the difference between named and anonymous functions while using Array.map and other alternatives.  http://jsperf.com/map-reduce-named-functions  (excuse the url name, there is no testing of Array.reduc...
The Benchmark: http://jsperf.com/substringing  So, I'm starting up my very first HTML5 browser-based client-side project.  It's going to have to parse very, very large text files into, essentially, an array or arrays of objects.  I know how I...
First of all, I made a quick jsperf test case to show the obvious : Object.create(null) is way slower than creating a object with the {} syntax. http://jsperf.com/js-object-creation-null-proto  But given this fact, can the former case be a good alter...
I have used JSperf to test a small sample of code.    According to a few articles I came across, both should have similar performance with test2 having a little edge. But here it's the complete opposite. Can someone explain why the huge differenc...
I ran a simple jsperf test and everything went as expected when running in Firefox but when I ran the test in Google Chrome is was confused.   The test is testing different ways of declaring function in JavaScript and then calling them. My guess is t...
This is kind of a random question, but I was wondering why a named callback was performing worse, for a click event, relative to an anonymous function.  Here is the link to the JSPerf tests I ran in Firefox and Chrome on Mac.  I guess my assumption w...
I ran the following jsperf https://jsperf.com/push-vs-define-anaoum  and found out that push in this case :  var a = []; a.push([1,2,3]); a.push(["a","b","c"]);   is faster than just declaring a with the subarrays inside :  va...
I'm working on a react custom renderer, which I have to shallow copy react props to the backend element, which there are reserved properties like "key", "ref", "children" I should filter out, especially the "children&#...
I have the following code in a test case on jsPerf:  var arr = [0, 45, 96, 8, 69, 62, 80, 91, 89, 24, 6, 23, 49, 88, 26, 40, 87, 61, 83, 2, 60, 53, 43, 82, 67, 3, 65, 37, 42, 77, 73, 38, 9, 46, 75, 10, 63, 15, 47, 28, 79, 55, 59, 95, 11, 93, 70, 98,...

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