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Getting the difference between two sets
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Try this
test2.removeAll(test1);
Set#removeAll
Removes from this set all of its elements that are contained in the specified collection (optional operation). If the specified collection is also a set, this operation effectively modifies this set so that its value is the asymmetri...
NSUserDefaults not cleared after app uninstall on simulator
... as well.
However, NSUserDefaults are NOT deleted when you remove an app from the simulator.
They are correctly deleted when you delete them from a physical device running iOS8.
A quick and annoying solution for now is to click, iOS Simulator -> Reset Content and Settings.
Xcode 9.2 with Sim...
Adding and removing style attribute from div with jquery
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You cannot remove the position or top attribute from the voltaic_holder element, because it does not have thos attributes. Those are css properties defined in the style attribute.
– Peter Olson
Mar 22 '11 at 17:02
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How can I sharpen an image in OpenCV?
...ing:
You use a Gaussian smoothing filter and subtract the smoothed version from the original image (in a weighted way so the values of a constant area remain constant).
To get a sharpened version of frame into image: (both cv::Mat)
cv::GaussianBlur(frame, image, cv::Size(0, 0), 3);
cv::addWeighted(f...
Guava equivalent for IOUtils.toString(InputStream)
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@ColinD, if the inputStream is coming from inside of a doPost servlet, is there any point in closing it? (or worrying about closing it)
– Blankman
Apr 22 '12 at 19:43
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How do I add comments to package.json for npm install?
...nts as in the first example { "//": "first", "//": "second"} prevents you from using npm version and other command line utils which usually reparse whole JSON and discard the duplicate keys in process.
– jakub.g
Jul 1 '14 at 11:51
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How to get numbers after decimal point?
...e round(0.5299999999999998 , 2) to get 0.53 Another way is to use Decimal from decimal package. docs.python.org/2/library/decimal.html
– SirJ
May 7 '19 at 11:49
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Can I catch multiple Java exceptions in the same catch clause?
... the same block if ExceptionB is inherited, either directly or indirectly, from ExceptionA. The compiler will complain:
Alternatives in a multi-catch statement cannot be related by subclassing
Alternative ExceptionB is a subclass of alternative ExceptionA
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How to paste in a new line with vim?
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Shortly after :help p it says:
:[line]pu[t] [x] Put the text [from register x] after [line] (default
current line). This always works |linewise|, thus
this command can be used to put a yanked block as
new lines.
:[line]pu[t]!...
Rails Observer Alternatives for 4.0
With Observers officially removed from Rails 4.0 , I'm curious what other developers are using in their place. (Other than using the extracted gem.) While Observers were certainly abused and could easily become unwieldily at times, there were many use-cases outside of just cache-clearing where they...