Aaron Gustafson aarongustafson
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aarongustafson
/ gist:245831
Created
November 30, 2009 22:25
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| eCSStender.register( | |
| {'selector': 'p'}, | |
| '*', | |
| function( selector, properties, media, specificity ) | |
| { | |
| console.log('eCSStender matched the selector "' + selector + | |
| '" in the media type ' + media + '. It’s properties follow:'); | |
| console.log(properties); | |
| console.log('The specificity of this selector is ' + specificity); | |
| } |
aarongustafson
/ circular-reference-memory-leak-1.html
Created
December 5, 2009 17:57
Based on examples from From http://www.ibm.com/developerworks/web/library/wa-memleak/
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| <html> | |
| <head> | |
| <title>Circular references between JavaScript and DOM</title> | |
| <script type="text/javascript"> | |
| // <![CDATA[ | |
| var obj; | |
| window.onload = function() | |
| { | |
| obj = document.getElementById("DivElement"); | |
| document.getElementById("DivElement").expandoProperty = obj; |
aarongustafson
/ dom-leak-fix.js
Created
December 5, 2009 19:37
Example of a memory leak issue in IE and how to resolve it
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| window.onload = function() | |
| { | |
| var | |
| body = document.getElementsByTagName('body')[0], | |
| div = document.createElement('div'), | |
| parentDiv, childDiv; | |
| for ( i = 0; i < 5000; i++ ) | |
| { | |
| parentDiv = div.cloneNode(true); | |
| parentDiv.onclick = foo; |
aarongustafson
/ directly-passed-regexp.js
Created
December 6, 2009 00:40
Regexp performance is faster when you "precompile" (examples from JavaScript Performance Rocks!)
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| function directPassing ( string ) | |
| { | |
| return string.match( /abc/ ); | |
| } |
aarongustafson
/ constructors.js
Created
December 6, 2009 00:44
Object and array literals are faster than constructors
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| function usingConstructors( string ) | |
| { | |
| var a = new Array(), o = new Object(); | |
| } |
aarongustafson
/ declare-vars-early.js
Created
December 6, 2009 00:58
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| function camelize( str ) | |
| { | |
| var | |
| HYPHEN = '-', | |
| bits = str.split(HYPHEN), | |
| length = bits.length, | |
| i = 1, | |
| new_str; | |
| if ( length == 1 ) { return bits[0]; } | |
| if ( str.charAt(0) == HYPHEN ) { |
aarongustafson
/ declare-vars-early.js
Created
December 6, 2009 00:58
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| function camelize( str ) | |
| { | |
| var | |
| HYPHEN = '-', | |
| bits = str.split(HYPHEN), | |
| length = bits.length, | |
| i = 1, | |
| new_str; | |
| if ( length == 1 ) { return bits[0]; } | |
| if ( str.charAt(0) == HYPHEN ) { |
aarongustafson
/ execute-if.js
Created
December 6, 2009 01:03
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| function f( a ) | |
| { | |
| if ( a == 1 ) | |
| { | |
| // do something | |
| } | |
| } |
aarongustafson
/ tricky-if.js
Created
December 6, 2009 01:14
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| if ( a++, b == 5 ) | |
| { | |
| // always increments a, but ONLY enters the block if b == 5 | |
| } |
aarongustafson
/ numeric-variable-pipe.js
Created
December 6, 2009 01:16
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| function someFunction( n ) | |
| { | |
| n |= 1; | |
| // same as n = n || 1; | |
| // doesn't work with anything but numbers | |
| } |
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