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What does ~~ (“double tilde”) do in Javascript?
...ample is:
-43.210 = 111111111111111111111111110101012
as a signed (two's complement) 32-bit binary number. (JavaScript ignores what is after the decimal point.) Inverting the bits gives:
NOT -4310 = 000000000000000000000000001010102 = 4210
Inverting again gives:
NOT 4210 = 111111111111111111111...
Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
...swer your question directly, but it will give you the elements that are in common. This can be done with Paul Murrell's package compare:
library(compare)
a1 <- data.frame(a = 1:5, b = letters[1:5])
a2 <- data.frame(a = 1:3, b = letters[1:3])
comparison <- compare(a1,a2,allowAll=TRUE)
compa...
Rails 4 - Strong Parameters - Nested Objects
... the implementation of permit and strong_parameters itself: https://github.com/rails/rails/blob/master/actionpack/lib/action_controller/metal/strong_parameters.rb#L246-L247
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Streaming video from Android camera to server
...n-source project to enable Android phone to IP camera:
http://code.google.com/p/ipcamera-for-android
Raw video data is fetched from LocalSocket, and the MDAT MOOV of MP4 was checked first before streaming. The live video is packed in FLV format, and can be played via Flash video player with a bui...
iOS (iPhone, iPad, iPodTouch) view real-time console log terminal
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Effect of NOLOCK hint in SELECT statements
...
1) Yes, a select with NOLOCK will complete faster than a normal select.
2) Yes, a select with NOLOCK will allow other queries against the effected table to complete faster than a normal select.
Why would this be?
NOLOCK typically (depending on your DB eng...
App.Config Transformation for projects which are not Web Projects in Visual Studio?
...iguration profile. These files
are just the changes you want made, not a complete copy of your
web.config.
You might think you'd want to use XSLT to transform a web.config, but
while they feels intuitively right it's actually very verbose.
Here's two transforms, one using XSLT and th...
Is there a way to make text unselectable on an HTML page? [duplicate]
...elect: none;
/*
Introduced in IE 10.
See http://ie.microsoft.com/testdrive/HTML5/msUserSelect/
*/
-ms-user-select: none;
user-select: none;
}
For IE < 10 and Opera, you will need to use the unselectable attribute of the element you wish to be unselectable. You can set thi...
Git rebase fails, 'Your local changes to the following files would be overwritten by merge'. No loca
...s file times, linux file times and mac file times. who knows, feel free to comment if you do.
Update: This blog post explains what's going on, sort of.
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Difference between ActionBarSherlock and ActionBar Compatibility
What is the difference between ActionBarSherlock and Action Bar Compatibility
7 Answers
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