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Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
...things: pressing A once and pressing select all + copy followed by paste j times (actually j-i-1 below; note the trick here: the contents are still in the clipboard, so we can paste it multiple times without copying each time). We only have to consider up to 4 consecutive pastes, since select, copy,...
Why is there no xrange function in Python3?
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Some performance measurements, using timeit instead of trying to do it manually with time.
First, Apple 2.7.2 64-bit:
In [37]: %timeit collections.deque((x for x in xrange(10000000) if x%4 == 0), maxlen=0)
1 loops, best of 3: 1.05 s per loop
Now, python.org ...
Why not be dependently typed?
...fact. Edwin Brady's language, Idris, performs type erasure (because no run-time behaviour depends on types) and generates a fairly standard lambda-lifted supercombinator encoding from which code is generated using stock G-machine techniques.
– pigworker
Oct 18 ...
Python Create unix timestamp five minutes in the future
...n "Expires" value 5 minutes in the future, but I have to supply it in UNIX Timestamp format. I have this so far, but it seems like a hack.
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StringBuilder vs String concatenation in toString() in Java
...re writing a single concatenation all in one place or accumulating it over time.
For the example you gave, there's no point in explicitly using StringBuilder. (Look at the compiled code for your first case.)
But if you are building a string e.g. inside a loop, use StringBuilder.
To clarify, assum...
list every font a user's browser can display
...r to choose a font.)
I'd prefer not to have to hardcode this list ahead of time or send it down from the server. (Intuitively, it seems like the browser should know what fonts it has and this should be exposed to javascript somehow.)
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Convert python datetime to epoch with strftime
I have a time in UTC from which I want the number of seconds since epoch.
8 Answers
8
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Why use String.Format? [duplicate]
...nd uses less overhead. Using concat +/& has to rebuild the string each time which can be very bad in large string objects. The very definition of a string is that it should be defined once and reused many times.(Many books teach us to use concat as examples but never tell us about performance!!)...
Measuring execution time of a function in C++
I want to find out how much time a certain function takes in my C++ program to execute on Linux . Afterwards, I want to make a speed comparison . I saw several time function but ended up with this from boost. Chrono:
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C++ performance challenge: integer to std::string conversion
...d::string. By changing just one line of code the function runs in half the time on my machine, using GCC. And by removing the std::string people would be able to use this function inside C programs.
– user1593842
May 4 at 22:35
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