大约有 30,000 项符合查询结果（耗时：0.0426秒） [XML]
How to implement the activity stream in a social network
... a batch of activities by activity ID or by using a set of friend IDs with time constraints.
Publish the activity IDs to Redis whenever an activity record is created, adding the ID to an "activity stream" list for every user who is a friend/subscriber that should see the activity.
Query Redis to...
How do I “git blame” a deleted line?
...ommand to show a reversed git log. The first commit shown will be the last time that line appears, and the next commit will be when it is changed or removed.
git log --reverse --ancestry-path COMMIT^..master
share
...
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...
What exactly are iterator, iterable, and iteration?
...s a general term for taking each item of something, one after another. Any time you use a loop, explicit or implicit, to go over a group of items, that is iteration.
In Python, iterable and iterator have specific meanings.
An iterable is an object that has an __iter__ method which returns an itera...
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...
What are Runtime.getRuntime().totalMemory() and freeMemory()?
I've been wondering what the exact meaning of Runtime.getRuntime().totalMemory() , Runtime.getRuntime().freeMemory() , and Runtime.getRuntime().maxMemory() is.
...
Pipe output and capture exit status in Bash
...olution. It's also something that's worth thinking about in general as any time you're doing a long-running command a name pipe is often the most flexible way. It's worth noting that some systems don't have mkfifo and may instead require mknod -p if I remember right.
– Haravikk...
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.
...
“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.
...
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
...