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How is pattern matching in Scala implemented at the bytecode level?
...but see below about custom extractors
case "hello" // equality check
case _ : Foo // instance of check
case x => // assignment to a fresh variable
case _ => // do nothing, this is the tail else on the if/else
There's much more that you can do with patterns like or patterns and combinations ...
pip broke. how to fix DistributionNotFound error?
Whenever i try to use pip I get an error. For exampple:
11 Answers
11
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Generate JSON string from NSDictionary in iOS
...)
-(NSString*) bv_jsonStringWithPrettyPrint:(BOOL) prettyPrint {
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:self
options:(NSJSONWritingOptions) (prettyPrint ? NSJSONWritingPrettyPrinted : 0)
...
How can we make xkcd style graphs?
...library(xkcd) Loading required package: extrafont Registering fonts with R Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : there is no package called ‘acepack’ Error: package or namespace load failed for ‘xkcd’ and trying for acepack yields > ...
How to throw std::exceptions with variable messages?
...tter & operator = (Formatter &);
};
Example:
throw std::runtime_error(Formatter() << foo << 13 << ", bar" << myData); // implicitly cast to std::string
throw std::runtime_error(Formatter() << foo << 13 << ", bar" << myData >> Formatt...
Map function in MATLAB?
...|
edited Apr 10 '18 at 15:05
answered Jun 11 '09 at 19:48
g...
When do you use Java's @Override annotation and why?
... context) {
return true;
}
This change will not cause any compile time errors or warnings - but it completely changes the intended behavior of the subclass.
To answer your question: you should use the @Override annotation if the lack of a method with the same signature in a superclass is indic...
How do I delete NuGet packages that are not referenced by any project in my solution?
...d package from package directory under solution (and you are still getting error), just open up the *.csproj file in code editor and remove the tag manually. Like for instance, I wanted to get rid of Nuget package Xamarin.Forms.Alias and I removed these lines from *.csproj file.
And finally, don't ...
How to grep and replace
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Why do I get "sed: RE error: illegal byte sequence". And yes, I added the -i "" for OS X. It works otherwise.
– taco
Jun 16 '16 at 19:51
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Conversion from Long to Double in Java
Is there any way to convert a Long data type to Double or double ?
8 Answers
8
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