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python design patterns [closed]
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Something you can use to simplify your code when calling attributes on objects that might or might not exist is to use the Null Object Design Pattern (to which I was introduced in Python Cookbook).
Roughly, the goal with Null objects is to provide an 'intelligent'
rep...
What is the difference between ArrayList.clear() and ArrayList.removeAll()?
...) is much faster since it doesn't have to deal with all those extra method calls.
And as Atrey points out, c.contains(..) increases the time complexity of removeAll to O(n2) as opposed to clear's O(n).
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How do I position one image on top of another in HTML?
...orner of the blue square (but not tight in the corner). I am trying to avoid compositing (with ImageMagick and similar) due to performance issues.
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How to uninstall Python 2.7 on a Mac OS X 10.6.4?
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Thanks for the heads up Ned, I did remove it, and found out the hard way that you have to reinstall Mac OS X. I'm leaving this here for anyone else who comes along and thinks the same thing I did. Don't remove Python in /System/Library/Frameworks/... None o...
Rails extending ActiveRecord::Base
... the ActiveSupport::Concern documentation for more details.
Create a file called active_record_extension.rb in the lib directory.
require 'active_support/concern'
module ActiveRecordExtension
extend ActiveSupport::Concern
# add your instance methods here
def foo
"foo"
end
# add ...
How do HttpOnly cookies work with AJAX requests?
...est to the server.
In the case of Stack Overflow, the cookies are automatically provided as part of the XmlHttpRequest request. I don't know the implementation details of the Stack Overflow authentication provider, but that cookie data is probably automatically used to verify your identity at a lo...
Get size of an Iterable in Java
...t values is actually a Collection and not only an Iterable, check this and call size() in case:
if (values instanceof Collection<?>) {
return ((Collection<?>)values).size();
}
// use Iterator here...
The call to size() will usually be much faster than counting the number of elements...
Get nested JSON object with GSON using retrofit
...ss, new MyDeserializer<DiffContent>())
.create();
When you call .fromJson() the type is carried into the deserializer, so it should then work for all your types.
And finally when creating a Retrofit instance:
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(url)...
Do I need to close() both FileReader and BufferedReader?
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According to BufferedReader source, in this case bReader.close call fReader.close so technically you do not have to call the latter.
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What is the difference between public, protected, package-private and private in Java?
...ax, it is important for this discussion).
C++ defines an additional level called "friend" and the less you know about that the better.
When should you use what? The whole idea is encapsulation to hide information. As much as possible you want to hide the detail of how something is done from your...