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When should I use the Visitor Design Pattern? [closed]
I keep seeing references to the visitor pattern in blogs but I've got to admit, I just don't get it. I read the wikipedia article for the pattern and I understand its mechanics but I'm still confused as to when I'd use it.
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How do I consume the JSON POST data in an Express application
I'm sending the following JSON string to my server.
6 Answers
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EProgrammerNotFound exception in Delphi?
In Delphi 2009, SysUtils.pas contains this in line 425:
8 Answers
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Ruby on Rails Server options [closed]
The whole issue of setting up a development server for my Ruby on Rails application confuses me. There are WEBrick, Mongrel, Passenger, Apache, Nginx and many more I am sure, and I don't really understand the different roles they play.
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ActiveMQ or RabbitMQ or ZeroMQ or [closed]
We'd be interested to hear any experiences with the pros and cons of ActiveMQ vs RabbitMQ vs ZeroMQ. Information about any other interesting message queues is also welcome.
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Method chaining - why is it a good practice, or not?
Method chaining is the practice of object methods returning the object itself in order for the result to be called for another method. Like this:
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How to change colors of a Drawable in Android?
I'm working on an android application, and I have a drawable that I'm loading up from a source image. On this image, I'd like to convert all of the white pixels to a different color, say blue, and then cache the resultant Drawable object so I can use it later.
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JavaScript: Is there a way to get Chrome to break on all errors?
I am looking for an equivalent in Chrome to the "break on all errors" functionality of Firebug. In the Scripts tab, Chrome has a "pause on all exceptions", but this is not quite the same as breaking on all errors.
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How can I initialize a String array with length 0 in Java?
The Java Docs for the method
String[] java.io.File.list(FilenameFilter filter)
includes this in the returns description:
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getActivity() returns null in Fragment function
I have a fragment (F1) with a public method like this
15 Answers
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