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Why do we have map, fmap and liftM?
...t learning Haskell, when using map incorrectly, would much
rather see an error about lists than about Functors.
-- Typeclassopedia, page 20
fmap and liftM exist because monads were not automatically functors in Haskell:
The fact that we have both fmap and liftM is an
unfortunate consequen...
Java: using switch statement with enum under subclass
... case VALUE_A: {
//..
break;
}
}
The clue is in the error. You don't need to qualify case labels with the enum type, just its value.
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What is meant with “const” at end of function declaration? [duplicate]
...d with the keyword const after a function declaration, makes it a compiler error for this class function to change a member variable of the class. However, reading of a class variables is okay inside of the function, but writing inside of this function will generate a compiler error.
Another way...
No Activity found to handle Intent : android.intent.action.VIEW
...
If you are also getting this error when trying to open a web page from your android app it is because your url looks like this:
www.google.com
instead of:
https://www.google.com or http://www.google.com
add this code to your Activity/Fragment:
publi...
Spring Data JPA - “No Property Found for Type” Exception
...; Foo, Long >{
Foo findByOldPropName( final String name );
}
The error indicated that it could no longer find "OldPropName" and threw the exception.
To quote the article on DZone:
When Spring Data creates a new Repository implementation, it analyzes all the methods defined by the inter...
Compare double to zero using epsilon
...ook at the context. It may be that epsilon is a reasonable estimate of the error in the calculation that produced someValue, and it may be that it isn't.
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Is there a use-case for singletons with database access in PHP?
...ic testing is impossible. I have to manually test everything via trial and error in a browser. Some errors might be preventable with code review (spelling, syntax errors) but functional errors are often hidden. This testing requires a lot more time then unit tests would. With unit tests I could say:...
Angular.js programmatically setting a form field to dirty
...u can use $setDirty() on fields (source). For example, for each field with error and marked required you can do the following:
angular.forEach($scope.form.$error.required, function(field) {
field.$setDirty();
});
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git rebase fatal: Needed a single revision
...e origin on a test repository (where origin has a HEAD) and I get the OP's error. The documentation for rebase doesn't say that a remote name is valid for the <upstream>.
– CB Bailey
Jan 25 '11 at 20:21
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jQuery append() - return appended elements
...
This will throw an error if newHtml is not valid HTML or a valid jQuery selector: $('/ This is Not HTML /').appendTo('#myDiv') results in Uncaught Error: Syntax error, unrecognized expression while $('#myDiv').append('/ This is Not HTML /') wor...