Created
November 5, 2009 13:23
-
-
Save madrobby/227048 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<h1>Demo code for "Extreme JavaScript Performance" @ JSConf.eu</h1> | |
<script> | |
var benchmark = function(m,i){ | |
var d1 = new Date, d2, r; | |
while(i--) r = m(); | |
d2 = new Date; | |
console.log(d2.getTime()-d1.getTime()); | |
// if(r) console.log(r); | |
} | |
//var str = "12.5"; | |
// | |
//benchmark(function(){ | |
// ~~(1 * str); | |
//}, 1000000); | |
// | |
//benchmark(function(){ | |
// parseInt(str); | |
//}, 1000000); | |
// | |
// | |
//benchmark(function(){ | |
// var test = ''; | |
// for (var i = 0;i<10000;i++) | |
// test = test + str; | |
//}, 100); | |
// | |
//benchmark(function(){ | |
// var test = '', i = 10000; | |
// while(i--) test = test + str; | |
//}, 100); | |
//benchmark(function(){ | |
// var w = window, i = 10000; | |
// while(i--) w.test = 'test'; | |
//}, 100); | |
// | |
//benchmark(function(){ | |
// var i = 10000; | |
// while(i--) window.test = 'test'; | |
//}, 100); | |
//var b = true, n = 99; | |
// | |
//benchmark(function(){ | |
// return n*n || b; | |
//}, 1000000); | |
// | |
//benchmark(function(){ | |
// return b || n*n; | |
//}, 1000000); | |
//benchmark(function(){ | |
// var obj = { prop: 'test', str: '' }; | |
// with(obj){ | |
// var i = 10000; | |
// while(i--) str += prop; | |
// return str; | |
// } | |
//}, 10); | |
// | |
//benchmark(function(){ | |
// var obj = { prop: 'test', str: '' }, i = 10000; | |
// while(i--) obj.str += obj.prop; | |
// return obj.str; | |
//}, 10); | |
var a = 0; | |
benchmark(function(){ | |
try{ | |
a += 1; | |
} catch(e) {} | |
}, 1000000); | |
benchmark(function(){ | |
a += 1; | |
}, 1000000); | |
(function(){ return 2 * 3; }).toString(); | |
</script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment