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django admin - add custom form fields that are not part of the model
... that based on these fields values I will build the long string expression and save it in the relevant model field.
5 Answe...
What is the Ruby (spaceship) operator?
...en return -1
if a = b then return 0
if a > b then return 1
if a and b are not comparable then return nil
It's useful for sorting an array.
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Wrapping null-returning method in Java with Option in Scala?
...ause Try is not about nullability checking but just a way to functionally handle exceptions.
Using Try to catch an exception and converting that to an Option for convenience will only show None in case an exception happens.
scala> Try(1/0).toOption
res11: Option[Int] = None
You want to preser...
How to copy a directory structure but only include certain files (using windows batch files)
... @Niels Brinch Yes, you should be able to do that. What is the exact command line you are using?
– aphoria
Sep 19 '12 at 23:53
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http HEAD vs GET performance
...ter than retrieving the entire resource.
You could implement both options and benchmark them to see which is faster, but rather than micro-optimize, I would focus on designing the ideal REST interface. A clean REST API is usually more valuable in the long run than a kludgey API that may or may not ...
Fast way of counting non-zero bits in positive integer
...1") is the fastest I could find in pure Python.
I tried adapting Óscar's and Adam's solutions to process the integer in 64-bit and 32-bit chunks, respectively. Both were at least ten times slower than bin(n).count("1") (the 32-bit version took about half again as much time).
On the other hand, gm...
Converting a String to DateTime
...
Since you are handling 24-hour based time and you have a comma separating the seconds fraction, I recommend that you specify a custom format:
DateTime myDate = DateTime.ParseExact("2009-05-08 14:40:52,531", "yyyy-MM-dd HH:mm:ss,fff",
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Spring JPA selecting specific columns
... answered Feb 25 '14 at 7:43
DurandalDurandal
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How to use Active Support core extensions
I have Active Support 3.0.3 installed and Rails 3.0.3 with Ruby 1.8.7.
5 Answers
5
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Is there a short contains function for lists?
...m not in list:
# do something
It's work fine for lists, tuples, sets and dicts (check keys).
Note that this is an O(n) operation in lists and tuples, but an O(1) operation in sets and dicts.
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