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List vs tuple, when to use each? [duplicate]
...ays for. But I've never quite squared this with the mutability issue mentioned in the other answers. Mutability has teeth to it (you actually can't change a tuple), while homogeneity is not enforced, and so seems to be a much less interesting distinction.
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Is recursion ever faster than looping?
...use it requires the allocation of a new stack frame. In some C compilers, one can use a compiler flag to eliminate this overhead, which transforms certain types of recursion (actually, certain types of tail calls) into jumps instead of function calls.
In functional programming language implementat...
How to delete migration files in Rails 3
...rake db:migrate VERSION=XXX on all environments, to the version before the one I want to delete.
Delete the migration file manually.
If there are pending migrations (i.e., the migration I removed was not the last one), I just perform a new rake db:migrate again.
If your application is already on p...
How to compare strings in Bash
... And if you do need an else clause and want to make a crazy one-liner: [ "$x" == "valid" ] && echo "valid" || echo "invalid"
– Matt White
Mar 1 '13 at 13:32
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Should I use 'border: none' or 'border: 0'?
...r border:0 because it's shorter; I find that easier to read. You may find none more legible. We live in a world of very capable CSS post-processors so I'd recommend you use whatever you prefer and then run it through a "compressor". There's no holy war worth fighting here but Webpack→LESS→PostCS...
Why is require_once so bad to use?
...call means checking that log. So there's definitely some extra work being done there but enough to detriment the speed of the whole app?
... I really doubt it... Not unless you're on really old hardware or doing it a lot.
If you are doing thousands of *_once, you could do the work yourself in a l...
How do I specify new lines on Python, when writing on files?
... as a suggestion, if we do not give a 'white space' after \n we do not get one space indent in second line. what i meant is: print 'First line \nSecond line'
– Manoj Kumar
Apr 1 '16 at 18:04
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RESTfully design /login or /register resources?
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One thing sticks out in particular as not REST-ful: the use of a GET request for logging out.
(from http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Safe_methods)
Some methods (for example, HEAD, GET, OPTIONS and TRA...
PowerShell: Run command from script's directory
... for. The others seem to be solving more problems than the straightforward one.
– Arvindh Mani
Aug 11 at 5:26
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Android Shared preferences for creating one time activity (example) [closed]
...ser signs in with that information. I have two classes, I take information one class and I want to use that information other class.When I use above code in my code. I take null pointer exception.Is there an usage like me? @KrauszLórántSzilveszter
– ZpCikTi
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