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What is a “callable”?
...t's clear what a metaclass is , there is an associated concept that I use all the time without knowing what it really means.
...
Creating the Singleton design pattern in PHP5
...
/**
* Singleton class
*
*/
final class UserFactory
{
/**
* Call this method to get singleton
*
* @return UserFactory
*/
public static function Instance()
{
static $inst = null;
if ($inst === null) {
$inst = new UserFactory();
...
Change all files and folders permissions of a directory to 644/755
How would I change all files to 644 and all folders to 755 using chmod from the linux command prompt? (Terminal)
8 Answ...
DateTime vs DateTimeOffset
...s a position on someone's calendar, and there are many different calendars all over the globe. We call these calendars time zones. Calendar time is represented by a DateTime where .Kind is DateTimeKind.Unspecified, or DateTimeKind.Local. And .Local is only meaningful in scenarios where you have a...
How do I remove the Devise route to sign up?
...ut a thread on the devise google group dissuaded me from searching for a really clean solution.
I'll quote José Valim (the Devise maintainer) :
There isn't a straight-forward option. You can either provide a patch
or use :skip => :registerable and add only the routes you want.
The origi...
Python != operation vs “is not”
...right hand side and the left hand side are the very same object. No methodcalls are done, objects can't influence the is operation.
You use is (and is not) for singletons, like None, where you don't care about objects that might want to pretend to be None or where you want to protect against object...
Short description of the scoping rules?
...
Actually, a concise rule for Python Scope resolution, from Learning Python, 3rd. Ed.. (These rules are specific to variable names, not attributes. If you reference it without a period, these rules apply.)
LEGB Rule
Local — N...
How to check if APK is signed or “debug build”?
... java.security.cert.CertificateException and android.content.pm.Signature. All other classes don't present multiple matches for me
– Christian García
Nov 29 '12 at 13:55
...
Best algorithm for detecting cycles in a directed graph [closed]
What is the most efficient algorithm for detecting all cycles within a directed graph?
14 Answers
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What is the difference between max-device-width and max-width for mobile web?
... actual device screen
Same goes for max-height and max-device-height naturally.
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