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- Screen name: les.szklanny
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- When selecting elements jQuery provides an optional 2nd argument (context) which limits the search to a specific node. Adding this argument usually speeds up queries, but when the query is by id adding the context actually siginificantly slows down the query.As a test, go here:and run this script in Firebug:
- console.time("1");
- for(var i=0; i<2000; i++) {
- $("#jq-intro");
- }
- console.timeEnd("1");
- console.time("2");
- for(var i=0; i<2000; i++) {
- $("#jq-content");
- $("#jq-intro");
- }
- console.timeEnd("2");
- console.time("3");
- for(var i=0; i<2000; i++) {
- $("#jq-intro", $("#jq-content"));
- }
- console.timeEnd("3");
On my slow test computer I see the following results:1: 53ms2: 103ms- 08-Mar-2010 09:05 PM
- Forum: Developing jQuery Core
Why this inconsistency?- jQuery.map([-1,0,1], function(e) {
- return e == -1 ? null : e;
- });
- returns: [0, 1]
- [-1,0,1].map(function(e) {
- return e == -1 ? null : e
- });
- returns: [null, 0, 1]
- The following code works fine but is not documented.Why is it not documented? Do you plan to support it in the future?
- $({}).bind("myEvent", function(evt, param) {
- alert(param);
- }).trigger("myEvent", "Hi there!")
- 17-Feb-2010 07:47 PM
- Forum: Developing jQuery Core
John, you wrote in another forum that jQuery 1.4.2 is faster than the latest Dojo on TaskSpeed.Is it really faster? This would be a huge improvement.Les- 12-Feb-2010 09:24 AM
- Forum: Developing jQuery Core
Hello,Why new Function is used in the code below instead of eval?According to this blog post eval is generally faster.- // Try to use the native JSON parser first
- return window.JSON && window.JSON.parse ?
- window.JSON.parse( data ) :
- (new Function("return " + data))()
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