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How to swap keys and values in a hash
... []
out[value] << key
end
end
end
Note: This code with tests is now on GitHub.
Or:
class Hash
def safe_invert
self.each_with_object({}){|(k,v),o|(o[v]||=[])<<k}
end
end
share
|
...
What is a message pump?
...ead or maintain a thread pool. A thread pool would have to be meticulously tested to make sure all COM references were correctly released. Even starting and shutting down instances requires you to make sure all references are released correctly. Failure to dot your i's and cross your t's here will r...
What are the differences between django-tastypie and djangorestframework? [closed]
... been using Django-rest-framework for a major project, and its awesome! I test-drove tastypie for a week early on, and have no regrets about going with DRF. The documentation is unfortunately not up to par with the code and the framework itself, but other than that, pure bliss.
...
nodeValue vs innerHTML and textContent. How to choose?
...han telling people what to do]
In case someone is wondering what's the fastest today:
https://jsperf.com/set-innertext-vs-innerhtml-vs-textcontent
& https://jsperf.com/get-innertext-vs-innerhtml-vs-textcontent (for the second test, the span's content is plain text, results might change accordin...
XPath to select multiple tags
...
You can avoid the repetition with an attribute test instead:
a/b/*[local-name()='c' or local-name()='d' or local-name()='e']
Contrary to Dimitre's antagonistic opinion, the above is not incorrect in a vacuum where the OP has not specified the interaction with namespace...
Sorting a vector of custom objects
...
}
};
std::vector < MyStruct > vec;
vec.push_back(MyStruct(4, "test"));
vec.push_back(MyStruct(3, "a"));
vec.push_back(MyStruct(2, "is"));
vec.push_back(MyStruct(1, "this"));
std::sort(vec.begin(), vec.end(), less_than_key());
Edit: As Kirill V. Lyadvinsky pointed out, instead of su...
Do DOM tree elements with ids become global variables?
... crazy as it seems this behavior is now technically safe to use in the latest version of all major browsers in standards mode. But while named access can seem somewhat convenient , it should not be used.
Why? A lot of the reasoning can be summed up in this article about why global variables are b...
Android: upgrading DB version and adding new table
...e version number, but before adding the execSQL call, the database on your test device/emulator may already believe it's at version 2.
A quick way to verify this would be to change the version number to 3 -- if it upgrades after that, you know it was just because your device believed it was already...
How do I add a tool tip to a span element?
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Yes I just tested it and also wasn't surprised it didn't work .Good old IE! ;)
– SearchForKnowledge
Mar 12 '15 at 14:14
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What is Android keystore file, and what is it used for?
...idnt mean you HAVE to sign it to debug it... but you can use keystore as a test implementation of your keytool.
– Adam Storm
Jul 27 '11 at 19:17
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