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What is the !! (not not) operator in JavaScript?
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Converts Object to boolean. If it was falsey (e.g. 0, null, undefined, etc.), it will be false, otherwise, true.
!oObject // inverted boolean
!!oObject // non inverted boolean so true boolean representation
So !! is not an operator, it's just the ! ...
Difference between EXISTS and IN in SQL?
What is the difference between the EXISTS and IN clause in SQL?
21 Answers
21
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Creating a new user and password with Ansible
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If you read Ansible's manual for user module, it'll direct you to the Ansible-examples github repo for details how to use password parameter.
There you'll see that your password must be hashed.
- hosts: all
user: root
v...
Regular expression \p{L} and \p{N}
...nd of numeric character in any script.
Source: regular-expressions.info
If you're going to work with regular expressions a lot, I'd suggest bookmarking that site, it's very useful.
share
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improv...
Why is this inline-block element pushed downward?
...shed downward rather than pulling it upward by one way or another. (and I know how to align their tops :))
8 Answers
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Creating a temporary directory in Windows?
...aged p/invoke code is worth it. Most would say it is not, but at least you now have a choice.
CreateParentFolder() is left as an exercise to the student. I use Directory.CreateDirectory(). Be careful getting the parent of a directory, since it is null when at the root.
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What is a pre-revprop-change hook in SVN, and how do I create it?
...Basically it's a script that is launched before unversioned property is modified on the repository, so that you can manage more precisely what's happening on your repository.
There are templates in the SVN distrib for different hooks, located in the /hooks subdirectory (*.tmpl that you have to edit...
Where is Vagrant saving changes to the VM?
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I was wondering if @pyfunc and other users here could help me with using vagrant on an existing VM that is not created using vagrant up in the first place. stackoverflow.com/q/14503932/80353
– Kim Stacks
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How can I connect to Android with ADB over TCP? [closed]
...ram and type:
su
setprop service.adb.tcp.port 5555
stop adbd
start adbd
Now go to your computer (assuming that you are using Windows) and create a shortcut on the desktop for "cmd.exe" (without the quotations).
Right click on the cmd shortcut and choose "Run as Administrator"
Change to your and...
Set title background color
...etextcolor">#FFFF00</color>
</resources>
In the AndroidMANIFEST.xml, set the theme attribute either in the application (for the whole application) or in the activity (only this activity) tags
<activity android:name=".CustomTitleBar" android:theme="@style/customTheme" ...
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