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Ruby, !! operator (a/k/a the double-bang) [duplicate]
...to decide this value is by checking to see if the current_user variable is set. If it is set, it will evaluate to true in a boolean context. If not, it will evaluate as false. The double negation forces the return value to be a boolean.
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Qt: can't find -lGL error
..., a fundamental dependency of Qt 5.x. This is a common error for devs when setting up for Qt development -- but once they install the OpenGL development lib they never see it again.
– pixelgrease
Jun 4 '15 at 23:04
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Removing viewcontrollers from navigation stack
I have a navigation stack, with say 5 UIViewControllers. I want to remove the 3rd and 4th viewcontrollers in the stack on the click of a button in the 5th viewcontroller. Is it possible to do this? If so how?
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Which is a better way to check if an array has more than one element?
...perform different functions. The first checks if the value at $arr['1'] is set, while the second returns the number of elements in the array.
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Remove blank lines with grep
I tried grep -v '^$' in Linux and that didn't work. This file came from a Windows file system.
14 Answers
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Collapse sequences of white space into a single character and trim string
...String = @" Hello this is a long string! ";
NSCharacterSet *whitespaces = [NSCharacterSet whitespaceCharacterSet];
NSPredicate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ''"];
NSArray *parts = [theString componentsSeparatedByCharactersInSet:whitespaces];
NSArra...
Why Maven uses JDK 1.6 but my java -version is 1.7
...f you imported a maven project into an IDE, then there is probably a maven setting in your IDE for default compiler that your maven runner is using.
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“There was an error while performing this operation”
I have a website in IIS for which I cannot open any of the settings like Authentication, Handler Mappings, Authorization Rules etc. It just shows the error message "There was an error while performing this operation", with no more details and points to web.config.
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AngularJS disable partial caching on dev machine
...s is open)
Update: In Firefox there is the same option in Debugger -> Settings -> Advanced Section (checked for Version 33)
Update 2: Although this option appears in Firefox some report it doesn't work. I suggest using firebug and following hadaytullah answer.
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How can I mark “To Do” comments in Xcode?
Currently I'm working on an iOS based Image Manipulation task.
10 Answers
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