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How to elegantly deal with timezones
...is, users can have a specific timezone. I was wondering how other SO users and applications approach this? The most obvious part is that inside the DB, date/times are stored in UTC. When on the server, all date/times should be dealt with in UTC. However, I see three problems that I'm trying to overc...
How to convert/parse from String to char in java?
...t to a character is probably to call the charAt method:
char c = s.charAt(0);
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eval command in Bash and its typical uses
After reading the bash man pages and with respect to this post .
10 Answers
10
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What is the most accurate way to retrieve a user's correct IP address in PHP?
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@Rook: Yes, I know. The OP is aware of that, and I've also mentioned it in my answer. But thanks for the comment.
– Alix Axel
Jun 25 '11 at 1:45
1
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Good examples of Not a Functor/Functor/Applicative/Monad?
...ariant functor out of it, but not a (covariant) functor. Try writing fmap and you'll fail. Note that the contravariant functor version is reversed:
fmap :: Functor f => (a -> b) -> f a -> f b
contramap :: Contravariant f => (a -> b) -> f b -> f a
A type constr...
How to Flatten a Multidimensional Array?
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You can use the Standard PHP Library (SPL) to "hide" the recursion.
$a = array(1,2,array(3,4, array(5,6,7), 8), 9);
$it = new RecursiveIteratorIterator(new RecursiveArrayIterator($a));
foreach($it as $v) {
echo $v, " ";
}
prints
1 2 3 4 ...
How to open a Bootstrap modal window using jQuery?
...e why this doesn't work in my case. I have the same demo code in my page, and I coded the submit button as above. However, when I click the submit, the modal window flashes fast and is gone. I have to click the browser 'back' button to return the page.
– Chris22
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栈和队列的面试题Java实现 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... Queue queue = new Queue();
//入队操作
for (int i = 0; i < 5; i++) {
queue.add(i);
}
//出队操作
System.out.println(queue.pop());
System.out.println(queue.pop());
System.out.println(queue.pop());
}
}
运...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...erally stated as a problem in Object-Relational mapping (ORM) discussions, and I understand that it has something to do with having to make a lot of database queries for something that seems simple in the object world.
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How can I view the source code for a function?
...S4 method dispatch system
The S4 system is a newer method dispatch system and is an alternative to the S3 system. Here is an example of an S4 function:
> library(Matrix)
Loading required package: lattice
> chol2inv
standardGeneric for "chol2inv" defined from package "base"
function (x, ...)...