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Ruby custom error classes: inheritance of the message attribute
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Given what the ruby core documentation of Exception, from which all other errors inherit, states about #message
Returns the result of invoking exception.to_s. Normally this returns
the exception’s message or name. By supplying a to_str method,
exceptions are agreeing to be used ...
RegEx for matching UK Postcodes
...that will validate a full complex UK postcode only within an input string. All of the uncommon postcode forms must be covered as well as the usual. For instance:
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jQuery on window resize
...onymous function a name, then:
$(window).on("resize", doResize);
http://api.jquery.com/category/events/
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Swift - Convert to absolute value
...alue.magnitude) // prints: 5
#2. Get absolute value of an Int from abs(_:) method
Swift has a global numeric function called abs(_:) method. abs(_:) has the following declaration:
func abs<T>(_ x: T) -> T where T : Comparable, T : SignedNumeric
Returns the absolute value of the g...
Advantages to Using Private Static Methods
When creating a class that has internal private methods, usually to reduce code duplication, that don't require the use of any instance fields, are there performance or memory advantages to declaring the method as static?
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module.exports vs exports in Node.js
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Setting module.exports allows the database_module function to be called like a function when required. Simply setting exports wouldn't allow the function to be
exported because node exports the object module.exports references. The following code wouldn't allow the...
How to execute an external program from within Node.js?
...cility through the ChildProcess class.
See http://nodejs.org/docs/v0.4.6/api/child_processes.html
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Quick and easy file dialog in Python?
...a UI, but right now I'm prompting the user for the file to parse using raw_input which is most unfriendly, especially because the user can't copy/paste the path. I would like a quick and easy way to present a file selection dialog to the user, they can select the file, and then it's loaded to the...
Python set to list
...k that you didn't overwrite list by accident:
>>> assert list == __builtins__.list
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What are C++ functors and their uses?
...42); // create an instance of the functor class
int i = add42(8); // and "call" it
assert(i == 50); // and it added 42 to its argument
std::vector<int> in; // assume this contains a bunch of values)
std::vector<int> out(in.size());
// Pass a functor to std::transform, which calls the fu...