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Is there an “exists” function for jQuery?
How can I check the existence of an element in jQuery?
43 Answers
43
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Difference between DTO, VO, POJO, JavaBeans?
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JavaBeans
A JavaBean is a class that follows the JavaBeans conventions as defined by Sun. Wikipedia has a pretty good summary of what JavaBeans are:
JavaBeans are reusable software components for Java that can be manipulated visually in a bui...
What are C++ functors and their uses?
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A functor is pretty much just a class which defines the operator(). That lets you create objects which "look like" a function:
// this is a functor
struct add_x {
add_x(int val) : x(val) {} // Constructor
int operator()(int y) co...
size_t vs. uintptr_t
The C standard guarantees that size_t is a type that can hold any array index. This means that, logically, size_t should be able to hold any pointer type. I've read on some sites that I found on the Googles that this is legal and/or should always work:
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In C# check that filename is *possibly* valid (not that it exists) [duplicate]
Is there a method in the System.IO namespace that checks the validity of a filename?
14 Answers
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How to wrap async function calls into a sync function in Node.js or Javascript?
...ll it to get actual data:
var output = getData();
Under the hood data is saved in a file so you implemented getData using Node.js built-in fs.readFileSync . It's obvious both getData and fs.readFileSync are sync functions. One day you were told to switch the underlying data source to a r...
Random row from Linq to Sql
What is the best (and fastest) way to retrieve a random row using Linq to SQL when I have a condition, e.g. some field must be true?
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Static class initializer in PHP
...zation stuff here
}
public static function getInstance()
{
if ( is_null( self::$instance ) )
{
self::$instance = new self();
}
return self::$instance;
}
public function someMethod1()
{
// whatever
}
public function someMethod2()
{
// whatever
}
}
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Difference between array_push() and $array[] =
...ition straight into the data structure. Thus, when adding a lot of data it is a lot quicker and resource-efficient to use $arr[].
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Is it feasible to compile Python to machine code?
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Try ShedSkin Python-to-C++ compiler, but it is far from perfect. Also there is Psyco - Python JIT if only speedup is needed. But IMHO this is not worth the effort. For speed-critical parts of code best solution would be to write them as C/C++ extensions.
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