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What is the right way to check for a null string in Objective-C?
...that people who are new to Objective C have trouble getting used to, especially coming form other languages where messages/method calls to nil crash.
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How can I explicitly free memory in Python?
...do its job. That said, if the OP is in a situation where he is suddenly deallocating a lot of objects (like in the millions), gc.collect may prove useful.
– Jason Baker
Aug 22 '09 at 19:53
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Algorithm to return all combinations of k elements from n
... set it's best to use a modified gray code algorithm so you aren't holding all of them in memory. These generate the next combination from the previous and avoid repetitions. There are many of these for different uses. Do we want to maximize the differences between successive combinations? minimize?...
What is the difference between onPause() and onStop() of Android Activites?
...android/app/Activity.html ,
it said 'Activity comes into foreground' will call onPause() , and 'Activity is no longer visible' will call onStop() .
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When is each sorting algorithm used? [closed]
...han a quick sort. There are some in-place merge sorts, but AFAIK they are all either not stable or worse than O(N log N). Even the O(N log N) in place sorts have so much larger a constant than the plain old merge sort that they're more theoretical curiosities than useful algorithms.
Heap sort: W...
How can I update a single row in a ListView?
... and some text. The image is loaded in a separate thread (with a queue and all) and when the image is downloaded, I now call notifyDataSetChanged() on the list adapter to update the image. This works, but getView() is getting called too frequently, since notifyDataSetChanged() calls getView()...
Using regular expressions to parse HTML: why not?
... I assumed we were discussing Perl-type regexes where they aren't actually regular expressions.
– Hank Gay
Feb 26 '09 at 16:12
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setting an environment variable in virtualenv
...variables to get its configuration, but I use virtualenv to test my app locally first.
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Java optional parameters
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varargs could do that (in a way). Other than that, all variables in the declaration of the method must be supplied. If you want a variable to be optional, you can overload the method using a signature which doesn't require the parameter.
private boolean defaultOptionalFlagVa...
How to create query parameters in Javascript?
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Just a small detail, but ret could be const
– Alkis Mavridis
Oct 18 '18 at 13:20
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