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How do I check in JavaScript if a value exists at a certain array index?
...You can test it for yourself using something like Firebug. In Javascript, reading the value of an undefined variable does not throw an exception - it returns the undefined value.
– thomasrutter
Apr 28 '10 at 1:43
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How to include *.so library in Android Studio?
I read many threads how to add a *.so library to Android Studio, but none of them works, especially when it comes to the point of text: This does not work with the newer xxx (Android Studio, gradle, ...)
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How do iOS Push Notifications work?
...l to APNs, which pushes the notification to the target device..
I suggest reading the documentation for more information and how to use and configure. It's all there.
Push Notifications
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ASP.NET 2.0 - How to use app_offline.htm
I've read about the app_offline.htm file which can be placed within the root of a .NET 2.0 application which will in essence shut down the application and disable any other pages from being requested.
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Convert xlsx to csv in Linux with command line
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The Gnumeric spreadsheet application comes with a command line utility called ssconvert that can convert between a variety of spreadsheet formats:
$ ssconvert Book1.xlsx newfile.csv
Using exporter Gnumeric_stf:stf_csv
$ cat newfile.csv
F...
Android SDK manager won't open
...lindly, I recommend running the android.bat in a command window so you can read the error message and apply the correct fix.
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JavaScript, elegant way to check nested object properties for null/undefined [duplicate]
... I like this solution for simple stuff that sometimes get harder to read with conditionals. @JonasStensved is pointing no using try catch on this because launching exception (you are not launching it until you write throw, i think) but the problem could be something else goes wrong in the blo...
grep output to show only matching file
...and cryptic – or the equivalent --files-with-matches – longer and more readable.
The output of grep --help is not easy to read, but it's there:
-l, --files-with-matches print only names of FILEs containing matches
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Best way to alphanumeric check in JavaScript
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return true;
};
Of course, there may be other considerations, such as readability. A one-line regular expression is definitely prettier to look at. But if you're strictly concerned with speed, you may want to consider this alternative.
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Remove ActiveRecord in Rails 3
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I'm going by this from reading the source, so let me know if it actually worked. :)
The rails command that generates the application template now has an option -O, which tells it to skip ActiveRecord.
If you don't feel like rerunning rails, you s...