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What does the “Just” syntax mean in Haskell?
... value was either constructed via Just or Nothing, there are no other (non-error) possibilities.
Since Nothing has no parameter type, when it's used as a constructor it names a constant value that is a member of type Maybe a for all types a. But the Just constructor does have a type parameter, whic...
Why catch and rethrow an exception in C#?
... // code that may throw exceptions
}
catch(Exception ex)
{
// add error logging here
throw;
}
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How to set breakpoints in inline Javascript in Google Chrome?
...ript console, which itself is buggy - for example, once it encounters a JS error, I cannot get out of it unless I refresh the whole page. Can someone help?
...
Define a lambda expression that raises an Exception
...ollowing also works: lambda: 1 / 0. You'll just end up with a ZeroDivisionError being thrown instead of a regular exception. Bear in mind that if the exception is allowed to propogate, it may look strange to someone debugging your code to start seeing a bunch of ZeroDivisionErrors.
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Why use Object.prototype.hasOwnProperty.call(myObj, prop) instead of myObj.hasOwnProperty(prop)?
... For example, host objects in IE implemented as ActiveX objects will throw errors if treated as native objects (hence why try..catch is used to initialise MS XMLHttpRequest objects). Some DOM objects (like NodeLists in IE in quirks mode) if passed to Array methods will throw errors, DOM objects in I...
How to hide action bar before activity is created, and then show it again?
... @AlexSemeniuk When I use that line in the manifest, I get this error: error: Error: No resource found that matches the given name (at 'theme' with value '@android:style/ Theme.NoActionBar').
– Si8
Aug 20 '13 at 13:02
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Join/Where with LINQ and Lambda
...uble with a query written in LINQ and Lambda. So far, I'm getting a lot of errors here's my code:
9 Answers
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How to mock an import
...
A.py:
import B
Note B.py does not exist, but when running test.py no error is returned and print(A.B.__name__) prints mock_B. You still have to create a mock_B.py where you mock B's actual functions/variables/etc. Or you can just assign a Mock() directly:
test.py:
import sys
sys.modules['B']...
How to remove unused imports from Eclipse
...ave Actions
– oers
Apr 17 '11 at 12:05
2
Note that this will also 'clean' them up by moving them ...
Download File Using Javascript/jQuery
...r the download starts or even inform the user in a friendly manner that an error has occurred. See the Demo for an example of this. Hope this helps someone!
Here is a simple use case demo using the plugin source with promises. The demo page includes many other, 'better UX' examples as well.
$.fil...