大约有 46,000 项符合查询结果（耗时：0.0427秒） [XML]
When is it appropriate to use UDP instead of TCP? [closed]
...
This is one of my favorite questions. UDP is so misunderstood.
In situations where you really want to get a simple answer to another server quickly, UDP works best. In general, you want the answer to be in one response packet, and y...
How do I count a JavaScript object's attributes? [duplicate]
... what code has executed before yours. So, you somehow have to separate the ones you defined from those you got "for free."
Here's one way:
var foo = {"key1": "value1", "key2": "value2", "key3": "value3"};
Object.prototype.foobie = 'bletch'; // add property to foo that won't be counted
var count =...
What is an existential type?
...
When someone defines a universal type ∀X they're saying: You can plug in whatever type you want, I don't need to know anything about the type to do my job, I'll only refer to it opaquely as X.
When someone defines an existential ty...
multiprocessing.Pool: When to use apply, apply_async or map?
...
Regarding apply vs map:
pool.apply(f, args): f is only executed in ONE of the workers of the pool. So ONE of the processes in the pool will run f(args).
pool.map(f, iterable): This method chops the iterable into a number of chunks which it submits to the process pool as separate tasks. So y...
How do you remove duplicates from a list whilst preserving order?
...me alternatives: http://www.peterbe.com/plog/uniqifiers-benchmark
Fastest one:
def f7(seq):
seen = set()
seen_add = seen.add
return [x for x in seq if not (x in seen or seen_add(x))]
Why assign seen.add to seen_add instead of just calling seen.add? Python is a dynamic language, and r...
How do I add a class to a given element?
...
If the only work on the whole page that needs to be done with JavaScript is this class name addition, then yes. But I can't see this being the only dynamic part of the page. A library will help with everything else as well. At 30-50kb jQuery is hardly a hit worth discussing.
...
Regular expression to match DNS hostname or IP Address?
Does anyone have a regular expression handy that will match any legal DNS hostname or IP address?
21 Answers
...
How can I start an interactive console for Perl?
...
Not only did Matt Trout write an article about a REPL, he actually wrote one - Devel::REPL
I've used it a bit and it works fairly well, and it's under active development.
BTW, I have no idea why someone modded down the person who mentioned using "perl -e" from the console. This isn't really a RE...
Java Persistence / JPA: @Column vs @Basic
...in JPA? Can they be used together? Should they be used together? Or does one of them suffice?
4 Answers
...
How can I change the color of pagination dots of UIPageControl?
... can register a delegate object to get notifications when the user taps on one of the little page dots. If no delegate is registered then the view will not react to touch input.
It's completely fresh from the oven, but seems to work. Let me know if you run into any problems with it.
Future improve...