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Is there a performance difference between a for loop and a for-each loop?
...{ /* do something using strings.get(i) */ }
Now the actual two cents: At least when I was testing these, the third one was the fastest when counting milliseconds on how long it took for each type of loop with a simple operation in it repeated a few million times - this was using Java 5 with jre1.6...
Elegant way to check for missing packages and install them?
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This looks nice but it doesn't seem to work, at least for me. When I tried the robust version of this, I get two error messages as R doesn't know how to handle "return True" and "return eval" for some reason. So I would really like a function like this that loads a package...
How to override and extend basic Django admin templates?
... the above solution WILL NO LONGER WORK for recent versions of Django (at least 1.4), as one of the functions the script uses is depreciated. You can find the updated source on here
– OldTinfoil
Mar 28 '13 at 17:11
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Who is calling the Java Thread interrupt() method if I'm not?
...s and the wrong ones): obviously it's a subject that is not trivial or, at least, usually not well explained. That said thanks to all the posts I'm beginning to get a clearer picture of what's going on :)
– SyntaxT3rr0r
Jan 24 '10 at 20:34
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How to detect my browser version and operating system using JavaScript?
... Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3; rv:11.0) like
Gecko
At least Chrome still has a string that contains "Chrome" with the exact version number. But, for IE you must extrapolate from the things it supports to actually figure it out (who else would boast that they support .NET or Medi...
How do I modify fields inside the new PostgreSQL JSON datatype?
...s, but that usually does not work well with polymorphic functions). But at least, you can use explicit casts, like $2::text.
– pozs
Apr 26 '15 at 22:16
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Difference between abstract class and interface in Python
...thods
__contains__, __iter__, __len__
So we are required to implement at least __contains__, __iter__, and __len__. Let's use this implementation example from the documentation:
class ListBasedSet(collections.Set):
"""Alternate set implementation favoring space over speed
and not requiri...
Which Boost features overlap with C++11?
...rward)
In Place Factory, Typed In Place Factory → Perfect forwarding (at least for the documented use cases)
Lambda → Lambda expression (in non-polymorphic cases)
Local function → Lambda expression
Min-Max → std::minmax, std::minmax_element
Ratio → std::ratio
Static Assert → static_asser...
Python hashable dicts
... individual classes (like str) may and do choose to cache their hashes. At least when I created a dict with my custom class instances used as keys, their __hash__ methods were called on every access operation (python 3.4). Whether or not I'm correct, I am not sure how hash(frozenset(self)) can reuse...
Setting log level of message at runtime in slf4j
... use it instead of slf4j 1) it probably needs to be richer, 2) lots of (at least) imports need to be changed, and 3) this new layer in front of slf4j adds an extra logging overhead.
– Stephen C
Oct 7 '18 at 23:17
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