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How and where are Annotations used in Java?
...way or another to be useful. Annotations can be interpreted at development-time by the IDE or the compiler, or at run-time by a framework.
Annotation processing is a very powerful mechanism and can be used in a lot of different ways:
to describe constraints or usage of an element: e.g. @Deprecat...
How can I delay a method call for 1 second?
...
You could also use a block
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
[object method];
});
Most of time you will want to use dispatch_get_main_queue, although if there is no UI in the method you could use a global q...
Get ffmpeg information in friendly way
Every time I try to get some information about my video files with ffmpeg, it pukes a lot of useless information mixed with good things.
...
How do iOS Push Notifications work?
...he notification from notification center and launches the app. During this time you can perform the processes that you wish to do.
– Karan Alangat
May 16 '17 at 9:17
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How can I output leading zeros in Ruby?
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Use String#next as the counter.
>> n = "000"
>> 3.times { puts "file_#{n.next!}" }
file_001
file_002
file_003
next is relatively 'clever', meaning you can even go for
>> n = "file_000"
>> 3.times { puts n.next! }
file_001
file_002
file_003
...
“Wrap with try…catch” in IntelliJ?
...r OS X.)
I like to check the Productivity Guide under the Help menu from time to time. Not only does it tell me all the shortcuts, but it keeps track of how many times I've used each one and when I last used it. I can see how well I'm leveraging the shortcuts.
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Replace values in list using Python [duplicate]
...odify the original list in-place if you want, but it doesn't actually save time:
items = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
for index, item in enumerate(items):
if not (item % 2):
items[index] = None
Here are (Python 3.6.3) timings demonstrating the non-timesave:
In [1]: %%timeit
...
Where does the “flatmap that s***” idiomatic expression in Scala come from?
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I personally use the list monad sometimes to deal with combinations.
– Dan Burton
Dec 20 '11 at 1:56
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Can I implement an autonomous `self` member type in C++?
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I used that solution a couple of times, and it has one BAD thing: when later deriving from Foo, you have to either: (1) propagate the T upwards to the leaf-descendant, or (2) remember to inherit from SelfT many times, or (3) accept that all children thing to...
SQL Inner-join with 3 tables?
... halls you could do it this way. You just join on your Hall table multiple times for each room pref id:
SELECT s.StudentID
, s.FName
, s.LName
, s.Gender
, s.BirthDate
, s.Email
, r.HallPref1
, h1.hallName as Pref1HallName
, r.HallPref2
, h2.hallName as Pref...