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If strings are immutable in .NET, then why does Substring take O(n) time?

...t a win; all you've done is made your garbage collector get slower because now it has to worry about handling interior pointers. If the substring operations people typically did on strings were completely different, then it would make sense to go with a persistent approach. If people typically had...
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Why JavaScript rather than a standard browser virtual machine?

...never went into IT). But it's not going to happen, and we're stuck with it now. I suspect, in time, it will become the "Machine language" for the web, with other better designed languages and APIs compile down to it (and cater for different runtime engine foibles). I don't think, however, any of t...
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How to duplicate virtualenv

...ext editor, you'll see something like: Django==1.3 Fabric==1.0.1 etc... Now, edit the line that says Django==x.x to say Django==1.3 (or whatever version you want to install in your new virtualenv). Lastly, activate your new virtualenv, and run: pip install -r requirements.txt And pip will aut...
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How to set a JavaScript breakpoint from code in Chrome?

...rs to be Chrome only at this time, but that's my primary platform anyways. Now I just need to remember to stop calling my global debugging flag "debug"... – brichins Sep 23 '16 at 21:48 ...
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jQuery get input value after keypress

... Works, but with jquery 2.x out this is out of date now as the answer below using the on and input is the best way to do it now. – Piotr Kula Jul 16 '14 at 16:14 ...
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SQL injection that gets around mysql_real_escape_string()

...5.6 by default: big5, cp932, gb2312, gbk and sjis. We'll select gbk here. Now, it's very important to note the use of SET NAMES here. This sets the character set ON THE SERVER. If we used the call to the C API function mysql_set_charset(), we'd be fine (on MySQL releases since 2006). But more on wh...
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Fastest way to get the first object from a queryset in django?

...'m pretty sure you'll even see this add LIMIT 1 to the query, and I don't know that you can do any better than this. However, internally __nonzero__ in QuerySet is implemented as try: iter(self).next() except StopIteration: return false... so it doesn't escape the exception. –...
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twitter bootstrap typeahead ajax example

...ed' ? false : process(json.options); } }); } }); Now you can make a unified code, placing "json-request" links in your HTML-code. share | improve this answer | ...
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Creating runnable JAR with Gradle

Until now I created runnable JAR files via the Eclipse "Export..." functionallity but now I switched to IntelliJ IDEA and Gradle for build automation. ...
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jQuery loop over JSON result from AJAX Success?

...on(data) { jQuery.each(data, function(index, item) { //now you can access properties using dot notation }); }, error: function(XMLHttpRequest, textStatus, errorThrown) { alert("some error"); } }); ...