Created
August 28, 2010 20:13
-
-
Save rwaldron/555527 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
// Results at 10,000,000 iterations | |
// $([]) omitted/not tested - caused chrome to crash | |
// $('null') omitted/not tested - caused chrome to crash | |
$(""): 1274ms | |
$(""): 1270ms | |
$(""): 1278ms | |
$(""): 1265ms | |
$(undefined): 1199ms | |
$(undefined): 1167ms | |
$(undefined): 1191ms | |
$(undefined): 1158ms | |
$(null): 1134ms | |
$(null): 1221ms | |
$(null): 1201ms | |
$(null): 1353ms | |
$(false): 1055ms | |
$(false): 1140ms | |
$(false): 1147ms | |
$(false): 1137ms | |
$(): 1203ms | |
$(): 1309ms | |
$(): 1161ms | |
$(): 1318ms | |
new jQuery.fn.init: 917ms | |
new jQuery.fn.init: 1050ms | |
new jQuery.fn.init: 939ms | |
new jQuery.fn.init: 919ms | |
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
// Results at 1,000,000 iterations | |
$([]): 1552ms | |
$([]): 1163ms | |
$([]): 1188ms | |
$([]): 1146ms | |
$("null"): 8082ms | |
$("null"): 4418ms | |
$("null"): 7643ms | |
$("null"): 7875ms | |
$(""): 132ms | |
$(""): 126ms | |
$(""): 131ms | |
$(""): 116ms | |
$(undefined): 123ms | |
$(undefined): 118ms | |
$(undefined): 133ms | |
$(undefined): 119ms | |
$(null): 161ms | |
$(null): 154ms | |
$(null): 148ms | |
$(null): 173ms | |
$(false): 116ms | |
$(false): 118ms | |
$(false): 119ms | |
$(false): 104ms | |
$(): 127ms | |
$(): 150ms | |
$(): 127ms | |
$(): 172ms | |
new jQuery.fn.init: 87ms | |
new jQuery.fn.init: 94ms | |
new jQuery.fn.init: 98ms | |
new jQuery.fn.init: 95ms | |
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
<!DOCTYPE html> | |
<html> | |
<head> | |
<title>jQuery Selects Nothing</title> | |
<script src="http://code.jquery.com/jquery.js"></script> | |
<script> | |
$(function () { | |
var iter = 1000000; // change to 10000000 for tsting | |
console.time('$([])'); | |
for ( var i = 0; i < iter; i++ ) { | |
var a = $([]); | |
} | |
console.log(a instanceof jQuery); //true | |
console.timeEnd('$([])'); | |
console.time('$("null")'); | |
for ( var i = 0 ; i < iter; i++ ) { | |
var ns = $('null'); | |
} | |
console.log(ns instanceof jQuery); // true | |
console.timeEnd('$("null")'); | |
console.time('$("")'); | |
for ( var i = 0; i < iter; i++ ) { | |
var es = $(""); | |
} | |
console.log(es instanceof jQuery); //true | |
console.timeEnd('$("")'); | |
console.time('$(undefined)'); | |
for ( var i = 0; i < iter; i++ ) { | |
var u = $(undefined); | |
} | |
console.log(u instanceof jQuery); //true | |
console.timeEnd('$(undefined)'); | |
console.time('$(null)'); | |
for ( var i = 0; i < iter; i++ ) { | |
var n = $(null); | |
} | |
console.log(n instanceof jQuery); //true | |
console.timeEnd('$(null)'); | |
console.time('$(false)'); | |
for ( var i = 0; i < iter; i++ ) { | |
var f = $(false); | |
} | |
console.log(f instanceof jQuery); //true | |
console.timeEnd('$(false)'); | |
console.time('$()'); | |
for ( var i = 0; i < iter; i++ ) { | |
var none = $(); | |
} | |
console.log(none instanceof jQuery); //true | |
console.timeEnd('$()'); | |
console.time('new jQuery.fn.init'); | |
for ( var i = 0; i < iter; i++ ) { | |
var init = new jQuery.fn.init; | |
} | |
console.log(init instanceof jQuery); //true | |
console.timeEnd('new jQuery.fn.init'); | |
}); | |
</script> | |
</head> | |
<body> | |
</body> | |
</html> |
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
// Handle $(""), $(null), or $(undefined) | |
if ( !selector ) { | |
return this; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment