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How can I negate the return-value of a process?

I'm looking for a simple, but cross-platform negate -process that negates the value a process returns. It should map 0 to some value != 0 and any value != 0 to 0, i.e. the following command should return "yes, nonexistingpath doesn't exist": ...
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Python non-greedy regexes

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Rails migrations: self.up and self.down versus change

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UIView Infinite 360 degree rotation animation?

I'm trying to rotate a UIImageView 360 degrees, and have looked at several tutorials online. I could get none of them working, without the UIView either stopping, or jumping to a new position. ...
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How to detect if a property exists on an ExpandoObject?

...n if the key does not exist, always return true return true; } . . . https://github.com/ASP-NET-MVC/aspnetwebstack/blob/master/src/System.Web.Mvc/DynamicViewDataDictionary.cs You can see it being tied into MVC Views here, in MVC ViewPage: http://aspnetwebstack.codeplex.com/SourceControl/late...
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How do I get the number of elements in a list?

Consider the following: 9 Answers 9 ...
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What is the difference between JVM, JDK, JRE & OpenJDK?

What is the difference between JVM , JDK , JRE & OpenJDK ? 19 Answers 19 ...
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How do you rotate a two dimensional array?

Inspired by Raymond Chen's post , say you have a 4x4 two dimensional array, write a function that rotates it 90 degrees. Raymond links to a solution in pseudo code, but I'd like to see some real world stuff. ...
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How to efficiently concatenate strings in go

...r answers. There is a library function in the strings package called Join: http://golang.org/pkg/strings/#Join A look at the code of Join shows a similar approach to Append function Kinopiko wrote: https://golang.org/src/strings/strings.go#L420 Usage: import ( "fmt"; "strings"; ) func main(...
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JavaScript - cannot set property of undefined

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