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What does the [Flags] Enum Attribute mean in C#?
...lowedColors: 00001110
So when you retrieve the value you are actually performing bitwise AND & on the values:
myProperties.AllowedColors: 00001110
MyColor.Green: 00000010
-----------------------
00000010 // Hey, this is the same as MyColor...
Computational complexity of Fibonacci Sequence
...* 1.618^(N+1) (approximately)
and say, therefore, that the worst case performance of the naive algorithm is
O((1/sqrt(5)) * 1.618^(N+1)) = O(1.618^(N+1))
PS: There is a discussion of the closed form expression of the Nth Fibonacci number over at Wikipedia if you'd like more information.
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Which is better option to use for dividing an integer number by 2?
...and b. Usually, the author will make choices that get the best possible performance out of the CPU.
– RBerteig
May 21 '12 at 20:35
6
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How to install packages offline?
...ages aren't on PYPI, so same applies to them.
Suppose you have a properly formed Python application in ~/src/myapp. ~/src/myapp/setup.py will have install_requires list that mentions one or more things that you have in your /pypi directory. Like so:
install_requires=[
'boto',
'Flask',
...
Relational Database Design Patterns? [closed]
... table with lots of pre-joined stuff that violates second and third normal form.
Array table. This is a table that violates first normal form by having an array or sequence of values in the columns.
Mixed-use database. This is a database normalized for transaction processing but with lots of extra...
Adding onClick event dynamically using jQuery
...ue to a plugin being used, I can't add the "onClick" attribute to the HTML form inputs like usual.
A plugin is handling the forms part in my site and it doesn't give an option to do this automatically.
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javascript remove “disabled” attribute from html input
... inputs[i].disabled = false;
}
Where document could be replaced with a form, for instance, to find only the elements inside that form. You could also use getElementsByTagName('input') to get all input elements. In your for iteration, you'd then have to check that inputs[i].type == 'text'.
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Android JSONObject - How can I loop through a flat JSON object to get each key and value
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Note: You can't use the short form for (String s: json.keys()) { ... } It's a real shame that neither JSONArray nor JSONObject are iterable. :-(
– tu-Reinstate Monica-dor duh
Jun 15 '15 at 2:25
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Convert two lists into a dictionary
...onary ?
dict = {'name' : 'Monty', 'age' : 42, 'food' : 'spam'}
Most performant, dict constructor with zip
new_dict = dict(zip(keys, values))
In Python 3, zip now returns a lazy iterator, and this is now the most performant approach.
dict(zip(keys, values)) does require the one-time global lo...
How to check if a given directory exists in Ruby
...undefined method `exists?' for Dir:Class (NoMethodError). Also, the plural form is now deprecated, use .exist? instead.
– Josip Rodin
Oct 22 '15 at 9:09
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