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How can I determine if a variable is 'undefined' or 'null'?

...the parentheses, but I appreciate the parentheses nonetheless - simply for reading clarity. – user664833 Sep 4 '14 at 23:28 ...
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What is Robocopy's “restartable” option?

...ntially unstable connection. Backup mode (/B) has to do with how robocopy reads files from the source system. It allows the copying of files on which you might otherwise get an access denied error on either the file itself or while trying to copy the file's attributes/permissions. You do need to ...
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Exit Shell Script Based on Process Exit Code

...d was interrupted by a SIGPIPE signal when head -1 terminated after having read one line. To know the exit status of the elements of a pipeline cmd1 | cmd2 | cmd3 a. with zsh: The exit codes are provided in the pipestatus special array. cmd1 exit code is in $pipestatus[1], cmd3 exit code in ...
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C++: variable 'std::ifstream ifs' has initializer but incomplete type

...s pretty noobish, but I'm pretty new to C++. I'm trying to open a file and read it using ifstream : 1 Answer ...
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How do you detect/avoid Memory leaks in your (Unmanaged) code? [closed]

...had been designed. An attacker can the several thousands required hours at reading the code in order to find a memory leak exploit. I would have expected an automated tool for source code analysis similar to what exist for JavaScript. – user2284570 Oct 2 '15 at...
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Invoking a jQuery function after .each() has completed

...guaranteed to be called before alert. could you explain or point me to the reading on this? – Maciej Jankowski Apr 6 '14 at 9:10 add a comment  |  ...
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Ideal way to cancel an executing AsyncTask

...e audio-file-fetching and audio file playback operations in a background thread using AsyncTask . A Cancellable progress bar is shown for the time the fetch operation runs. ...
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Where could I buy a valid SSL certificate? [closed]

... the identity of the owner of the site (well, that's the claim). You can read more on this subject here For your second question, I can personally recommend RapidSSL. I've bought several certificates from them in the past and they are, well, rapid. However, you should always do your research firs...
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Is “ ” a replacement of “ ”?

...d its actual value. The lookup table is called a DTD, by the way. You can read more about character entity references in the offical W3C documents. share | improve this answer | ...
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When and why to 'return false' in JavaScript?

...reventDefault(); e.stopPropagation(); } though I would still recommend reading the whole article. Update: After arguing the merits of using return false; as a replacement for e.preventDefault(); & e.stopPropagation(); one of my co-workers pointed out that return false also stops callback ex...