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Why do Java webapps use .do extension? Where did it come from?

...oach will be described below. Prefix matching means that you want all URLs that start (after the context path part) with a particular value to be passed to this servlet. Such an entry might look like this: <servlet-mapping> <servlet-name>action</servlet-name> ...
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What do Clustered and Non clustered index actually mean?

... With a clustered index the rows are stored physically on the disk in the same order as the index. Therefore, there can be only one clustered index. With a non clustered index there is a second list that has pointers to the physical rows. You can have many non clustered ind...
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How to disable HTML links

... solution if you need to support IE (and you can change your HTML) but... All this said please note that pointer-events disables only...pointer events. Links will still be navigable through keyboard then you also need to apply one of the other techniques described here. Focus In conjunction with ...
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What is fastest children() or find() in jQuery?

... depends on whether you only want to consider the immediate descendants or all nodes below this one in the DOM, i.e., choose the appropriate method based on the results you desire, not the speed of the method. If performance is truly an issue, then experiment to find the best solution and use that (...
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What's the difference between lapply and do.call?

I'm learning R recently and confused by two function: lapply and do.call . It seems that they're just similar to map function in Lisp. But why are there two functions with such a different name? Why doesn't R just use a function called map ? ...
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How to terminate the script in JavaScript?

... JavaScript equivalent for PHP's die. BTW it just calls exit() (thanks splattne): function exit( status ) { // http://kevin.vanzonneveld.net // + original by: Brett Zamir (http://brettz9.blogspot.com) // + input by: Paul // + bugfixed by: Hyam Singer...
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Bitwise operation and usage

...Bitwise operators are operators that work on multi-bit values, but conceptually one bit at a time. AND is 1 only if both of its inputs are 1, otherwise it's 0. OR is 1 if one or both of its inputs are 1, otherwise it's 0. XOR is 1 only if exactly one of its inputs are 1, otherwise it's 0. NOT is 1...
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Difference between “managed” and “unmanaged”

... Unmanaged code compiles straight to machine code. So, by that definition all code compiled by traditional C/C++ compilers is 'unmanaged code'. Also, since it compiles to machine code and not an intermediate language it is non-portable. No free memory management or anything else the CLR provides. ...
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Get contentEditable caret index position

...true; if(found[i == 0 ? 1 : 0]) return false; // all done } } if(node.textContent && !node.firstChild) { for(i = 0; i < 2; i++) { if(!found[i]) cum_length[i] += node.textContent.length; } ...
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How to use '-prune' option of 'find' in sh?

... test (up to and including -prune) will return false for the stuff you actually want (ie: the stuff you don't want to prune out). Here's an example: find . -name .snapshot -prune -o -name '*.foo' -print This will find the "*.foo" files that aren't under ".snapshot" directories. In this example, -na...