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Are tuples more efficient than lists in Python?
... disassemble x = ListLike((1, 2, 3, 4, 5)); y = x[2]. The bytecode will be more like the tuple example above than the list example, but do you really believe that means performance will be similar?
– mzz
Jan 31 '10 at 15:21
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Recursion or Iteration?
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It is possible that recursion will be more expensive, depending on if the recursive function is tail recursive (the last line is recursive call). Tail recursion should be recognized by the compiler and optimized to its iterative counterpart (while maintaining th...
Java: when to use static methods
... involves two Car objects, and still want it to be static. E.g.:
Car theMoreEfficientOf( Car c1, Car c2 )
Although this could be converted to a non-static version, some would argue that since there isn't a "privileged" choice of which Car is more important, you shouldn't force a caller to choos...
Should I return a Collection or a Stream?
...;T> c = getFooStream().collect(toList());
So the question is, which is more useful to your callers.
If your result might be infinite, there's only one choice: Stream.
If your result might be very large, you probably prefer Stream, since there may not be any value in materializing it all at once,...
What is a software framework? [closed]
... one nice packet, hence providing the abstraction for your application and more importantly many applications.
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More elegant way of declaring multiple variables at the same time
...the upside, it may help to explain the concepts of iterables and iterators more clearly.
Defining the function invert_dict such that it actually returns a dictionary is not a bad idea either; I mostly just didn't do that because it doesn't really help to explain how the routine works.
Apparent...
What is an anti-pattern?
...ilities for different objects to keep the code less coupled and ultimately more maintainable:
class FileInputOutput {
function ReadFromFile() {}
function WriteToFile() {}
}
class UserInputOutput {
function DisplayToScreen() {}
function ValidateInput() {}
}
class Logic {
functi...
How to declare global variables in Android?
...subclassing Application. Read it at your own risk.
ORIGINAL ANSWER:
The more general problem you are encountering is how to save state across several Activities and all parts of your application. A static variable (for instance, a singleton) is a common Java way of achieving this. I have found ho...
Performance optimization strategies of last resort [closed]
... code, bringing the time down to 20 seconds.
Now the largest time-taker is more list-building. As a percentage, it was not so big before, but now it is because the bigger problem was removed. I find a way to speed it up, and the time drops to 17 seconds.
Now it is harder to find obvious culprits, bu...
Hash collision in git
... randomly from a given set, you need surprisingly few picks before you are more likely than not to have picked something twice. But "surprisingly few" is a very relative term here.
Wikipedia has a table on the probability of Birthday Paradox collisions. There is no entry for a 40 character hash. But...