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How do I implement basic “Long Polling”?
I can find lots of information on how Long Polling works (For example, this , and this ), but no simple examples of how to implement this in code.
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How to prevent buttons from submitting forms
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You're using an HTML5 button element. Remember the reason is this button has a default behavior of submit, as stated in the W3 specification as seen here:
W3C HTML5 Button
So you need to specify its type explicitly:
<button type="button">Button</button>
in order to over...
Namespace + functions versus static methods on a class
...namespaces.
In Object Oriented code
Scott Meyers wrote a whole Item for his Effective C++ book on this topic, "Prefer non-member non-friend functions to member functions". I found an online reference to this principle in an article from Herb Sutter: http://www.gotw.ca/gotw/084.htm
The important t...
Pandas selecting by label sometimes return Series, sometimes returns DataFrame
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Granted that the behavior is inconsistent, but I think it's easy to imagine cases where this is convenient. Anyway, to get a DataFrame every time, just pass a list to loc. There are other ways, but in my opinion this is the cleanest.
In [2]: type(df....
Non greedy (reluctant) regex matching in sed?
...-greedy quantifier; you need a later regex. Fortunately, Perl regex for this context is pretty easy to get:
perl -pe 's|(http://.*?/).*|\1|'
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ViewPager and fragments — what's the right way to store fragment's state?
...on of UI logic into some modules. But along with ViewPager its lifecycle is still misty to me. So Guru thoughts are badly needed!
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Does adding a duplicate value to a HashSet/HashMap replace the previous value
...places the old value with the new one.
In the case of HashSet, the item isn't inserted.
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What is the use of ByteBuffer in Java? [closed]
What are example applications for a ByteBuffer in Java? Please list any example scenarios where this is used. Thank you!
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ArrayList vs List in C#
What is the difference between ArrayList and List<> in C#?
12 Answers
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delete a.x vs a.x = undefined
Is there any substantial difference in doing either of these?
9 Answers
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