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Singleton pattern in nodejs - is it needed?
...
This has basically to do with nodejs caching. Plain and simple.
https://nodejs.org/api/modules.html#modules_caching
(v 6.3.1)
Caching
Modules are cached after the first time they are loaded. This means
(among other things) th...
What is a clean, pythonic way to have multiple constructors in Python?
... kwargs: {'param': 3}
http://docs.python.org/reference/expressions.html#calls
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What is the difference between an int and an Integer in Java and C#?
...aning, if you made a new Integer:
Integer i = new Integer(6);
You could call some method on i:
String s = i.toString();//sets s the string representation of i
Whereas with an int:
int i = 6;
You cannot call any methods on it, because it is simply a primitive. So:
String s = i.toString();//...
What is move semantics?
... you include this sentence) and meant the exact same object every time? We call expressions such as x "lvalues".
The arguments in lines 2 and 3 are not lvalues, but rvalues, because the underlying string objects have no names, so the client has no way to inspect them again at a later point in time....
How to refresh app upon shaking the device?
...t z position. */
private float lastZ = 0;
/** OnShakeListener that is called when shake is detected. */
private OnShakeListener mShakeListener;
/**
* Interface for shake gesture.
*/
public interface OnShakeListener {
/**
* Called when shake gesture is detected.
*/
...
How can I pass an argument to a PowerShell script?
...ate -eq 1)
{
$iTunes.PlayerPosition = $iTunes.PlayerPosition + $step
}
Call it with
powershell.exe -file itunesForward.ps1 -step 15
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Hidden Features of PHP? [closed]
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This is a great feature of PHP, but I wouldn't really call it hidden... If you've ever googled for method parameters, etc, you would end up at php.net.
– John Bubriski♦
Mar 23 '09 at 17:04
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“icon-bar” in twitter bootstrap navigation bar
...con-bar in bootstrap.css:
.navbar-toggle .icon-bar {
display: block;
width: 22px;
height: 2px;
background-color: #cccccc;
border-radius: 1px;
}
It is a block structure, so it is aligned line by line. The background-color is set to be gray80. Actually, you can change its width, height, b...
Unable to add window — token android.os.BinderProxy is not valid; is your activity running?
...rary spins off the auth operation asynchronously, and you have a Handler - Callback mechanism (onComplete called on a listener) that could easily create this scenario.
When I've seen this reported in my app, its pretty rare and matches the experience in the blog post. Something went wrong for the a...
Use of class definitions inside a method in Java
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This is called a local class.
2 is the easy one: yes, a class file will be generated.
1 and 3 are kind of the same question. You would use a local class where you never need to instantiate one or know about implementation details ...