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Using -performSelector: vs. just calling the method
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- (void)performSelector:(SEL)aSelector target:(id)target argument:(id)arg order:(NSUInteger)order modes:(NSArray *)modes;
- (void)performSelectorOnMainThread:(SEL)aSelector withObject:(id)arg waitUntilDone:(BOOL)wait modes:(NSArray *)array;
- (void)performSelectorOnMainThread:(SEL)aSelector withObj...
Why do we need a fieldset tag?
...entified categories.
Different browsers may display the default fieldset border in different ways. Cascading Style Sheets can be used to remove the border or change its appearance.
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Android - How To Override the “Back” button so it doesn't Finish() my Activity?
...zable("object_key",
someSerializableClassYouWantToPersist);
// etc. until you have everything important stored in the bundle
}
Then you use onCreate(Bundle) to get everything out of that persisted bundle and recreate your state.
@Override
onCreate(Bundle savedInstanceState) {
if(s...
try {} without catch {} possible in JavaScript?
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this answer is the most up to date! in terms of execution order, 1. it attempts the try block. 2. Catches the error. 3. Executes the finally block. 4. Throws the error. Is this correct?
– helsont
Jun 20 '19 at 17:16
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Loop through an array in JavaScript
...ject properties.
It shouldn't be used for array-like objects because:
The order of iteration is not guaranteed; the array indexes may not be visited in numeric order.
Inherited properties are also enumerated.
The second point is that it can give you a lot of problems, for example, if you extend th...
Can I combine :nth-child() or :nth-of-type() with an arbitrary selector?
... by the rest of the selector.
This also implies that there is no notion of order among simple selectors within each individual compound selector1, which means for example the following two selectors are equivalent:
table.myClass tr.row:nth-child(odd)
table.myClass tr:nth-child(odd).row
Translated t...
What is the difference between UNION and UNION ALL?
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UNION removes duplicates, whereas UNION ALL does not.
In order to remove duplicates the result set must be sorted, and this may have an impact on the performance of the UNION, depending on the volume of data being sorted, and the settings of various RDBMS parameters ( For Oracle PG...
What is aspect-oriented programming?
...important things leading to code-rot, people going home to their families, etc.)
I put my hopes to composite oriented programming, which is something more and more realistic. It connects to many popular ideas and gives you something really cool.
Look at an up and coming implementation here: qi4j.o...
Splitting templated C++ classes into .hpp/.cpp files--is it possible?
...'s going on, remove confusion around makefiles targeting actual cpp files, etc.
– underscore_d
Jan 15 '16 at 11:55
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How do I activate a virtualenv inside PyCharm's terminal?
...ript into a bin directory somewhere. E.g. ~/bin/pycharmactivate
if [ -r "/etc/profile" ] ; then . /etc/profile ; fi
if [ -r "~/.bash_profile" ] ; then
. ~/.bash_profile
elif [ -r "~/.bash_login" ] ; then
. ~/.bash_login
elif [ -r "~/.profile" ] ; then
. ~/.profile
fi
ACTIVATERC=`cat .id...