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What is “callback hell” and how and why does RX solve it?
...his version is uglier than the previous one. :-)
2) When (in what kind of settings) does the "callback hell problem" occur?
When you have lots of callback functions in your code! It gets harder to work with them the more of them you have in your code and it gets particularly bad when you need to d...
Spring MVC: How to perform validation?
...e validation errors, result.hasErrors() will be true.
Note : You can also set the validator in a @InitBinder method of the controller, with "binder.setValidator(...)" (in which case a mix use of method 1 and 2 would not be possible, because you replace the default validator). Or you could instantia...
JPA: unidirectional many-to-one and cascading delete
...te any orphaned children when the child entity in the parent collection is set to null, i.e. remove the child when it is not present in any parent's collection.
Or, specify the foreign key constraint in the child table as ON DELETE CASCADE. You'll need to invoke EntityManager.clear() after calling E...
Why am I seeing an “origin is not allowed by Access-Control-Allow-Origin” error here? [duplicate]
...erver of the API or remote resource (in this case the YouTube server) must set the header, i.e. it is the API hoster who must set this header, and not the API caller.
– 0x4a6f4672
May 23 '12 at 13:15
...
Reset PHP Array Index
...
If you want to reset the key count of the array for some reason;
$array1 = [
[3] => 'Hello',
[7] => 'Moo',
[45] => 'America'
];
$array1 = array_merge($array1);
print_r($array1);
Output:
Array(
[0] => 'Hello',
[1] =...
Building C# Solution in Release mode using MSBuild.exe
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Java regular expression OR operator
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How to move an element into another element?
... element is moved: it will be moved into the target (not cloned) and a new set consisting of the inserted element is returned - api.jquery.com/appendto
– John K
Jan 13 '14 at 1:10
...
Recursively remove files
... supports ** too :-) (though not by default, shopt -s globstar needs to be set)
– ephemient
Jan 6 '10 at 23:26
...
Can anonymous class implement interface?
...nterfaceImplementor : IDummyInterface
{
public string A { get; set; }
public string B { get; set; }
}
public void WillThisWork()
{
var source = new DummySource[0];
var values = from value in source
select new DummyInterfaceImpleme...