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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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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 ...
mongodb find by multiple array items
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This helped me too, I needed it to find an object ID in an array, and where something like $in: [ ObjectId("4f9f2c336b810d0cf0000017") ] failed, $in: [ "4f9f2c336b810d0cf0000017" ] worked
– jbnunn
May 3 '12 at 15:43
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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 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)...
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...
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...
Is floating-point math consistent in C#? Can it be?
...Use native code for the math operations. Incurs the overhead of a delegate call on every math operation.
I've just started a software implementation of 32 bit floating point math. It can do about 70million additions/multiplications per second on my 2.66GHz i3.
https://github.com/CodesInChaos/SoftF...
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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