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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 =...
When is it appropriate to use UDP instead of TCP? [closed]
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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 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?
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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.
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multiprocessing.Pool: When to use apply, apply_async or map?
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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...
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
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What is an existential type?
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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...
How can I start an interactive console for Perl?
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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
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How to make clang compile to llvm IR
...th assembly (defaulting to the machine architecture you run it on). llc is one of the LLVM tools - here is its documentation.
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