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What is the use of printStackTrace() method in Java?
... very useful tool for diagnosing an exceptions. It tells you what happened and where in the code this happened.
Here's an example of how it might be used in practice:
try {
// ...
} catch (SomeException e) {
e.printStackTrace();
}
...
Simplest code for array intersection in javascript
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Use a combination of Array.prototype.filter and Array.prototype.includes:
array1.filter(value => array2.includes(value))
For older browsers, with Array.prototype.indexOf and without an arrow function:
array1.filter(function(n) {
return array2.indexOf(n) !== ...
Separating class code into a header and cpp file
I am confused on how to separate implementation and declarations code of a simple class into a new header and cpp file. For example, how would I separate the code for the following class?
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How to get ALL child controls of a Windows Forms form of a specific type (Button/Textbox)?
...r you. I tested it by creating a sample application, I then put a GroupBox and a GroupBox inside the initial GroupBox. Inside the nested GroupBox I put 3 TextBox controls and a button. This is the code I used (even includes the recursion you were looking for)
public IEnumerable<Control> GetAl...
Escaping HTML strings with jQuery
...L from strings in jQuery ? I need to be able to pass an arbitrary string and have it properly escaped for display in an HTML page (preventing JavaScript/HTML injection attacks). I'm sure it's possible to extend jQuery to do this, but I don't know enough about the framework at the moment to accomp...
Garbage collector in Android
I have seen many Android answers that suggest calling the garbage collector in some situations.
11 Answers
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Pointer to pointer clarification
...are doing is *ipp get the object at the address held in ipp which is ip1 and then assign to ip1 the value stored in ip2, which is the address of j.
Simply
& --> Address of
* --> Value at
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Windows can't find the file on subprocess.call()
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When the command is a shell built-in, add a 'shell=True' to the call.
E.g. for dir you would type:
import subprocess
subprocess.call('dir', shell=True)
To quote from the documentation:
The only time you need to specify shell=True ...
How to convert std::string to LPCWSTR in C++ (Unicode)
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(Found this question browsing randomly; it's been a long time since I did C++.) So the standard library doesn't have std::string -> std::wstring conversion? That seems weird; is there a good reason?
– Domenic
Jul 2...
Static class initializer in PHP
... whatever
}
public function someMethod2()
{
// whatever
}
}
And then, in usage
// As opposed to this
Singleton::someMethod1();
// You'd do this
Singleton::getInstance()->someMethod1();
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