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How do I wait for an asynchronously dispatched block to finish?
...ate (eg callbacks/delegate protocols, being available, going away, errors, etc.). (These can be refactored into blocks if you don't like callback hell.) Because this is how to expose real behavior to the rest of the app than hide it behind a false façade.
Instead, use NSNotificationCenter, defin...
“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
...hough PHP does not require a variable declaration, it does recommend it in order to avoid some security vulnerabilities or bugs where one would forget to give a value to a variable that will be used later in the script. What PHP does in the case of undeclared variables is issue a very low level erro...
What is recursion and when should I use it?
...lude traversing hierarchies, e.g. website crawlers, directory comparisons, etc.
Conclusion
In practical terms, recursion makes the most sense whenever you need iterative branching.
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Xcode Project vs. Xcode Workspace - Differences
...ition of building a project, so every project needs at least one target in order to be more than just a collection of files and settings.
Select one of the project’s targets to run
In a lot of cases, projects are all you need. If you have a dependency that you build from source, you can embed ...
What is the “continue” keyword and how does it work in Java?
...simply for clarity.
Sometimes continue is also used as a placeholder in order to make an empty loop body more clear.
for (count = 0; foo.moreData(); count++)
continue;
The same statement without a label also exists in C and C++. The equivalent in Perl is next.
This type of control flow is ...
How to draw vertical lines on a given plot in matplotlib?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Looking to understand the iOS UIViewController lifecycle
... with the view controller's view. Like add it as a subview, set the frame, etc. It is also called of course when loading from a nib.
– Jason Grandelli
Oct 16 '13 at 13:43
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How can I check if a URL exists via PHP?
...returned by get_headers() are well formed.
Use curl (if you can).
Prevent fetching the entire body/content, but only request the headers.
Consider redirecting urls:
Do you want the first code returned?
Or follow all redirects and return the last code?
You might end up with a 200, but it could redire...
Compiling dynamic HTML strings from database
...v dynamic="htmlString">dddzzz</div>')); Any ideas on workarounds etc...
– landed
Jun 4 '15 at 9:59
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How to use sessions in an ASP.NET MVC 4 application?
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It's also recommended to not store any sensitive data in them (passwords, etc).
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