The idiomatic way to iterate over an array is: for _, armyName in ipairs(armies) do doStuffWithArmyName(armyName) end Note that: Use ipairs over pairs for arrays If the key isn’t what you are interested, use _ as placeholder. If, for some reason, that _ placeholder still concerns you, make your own iterator. Programming in Lua provides … Read more
As per this thread from 2004 on slashdot.org, high contrast is the way to go. Some of the commenters also note that the human eye is more sensitive to greens and yellows. I went into paint and made a bunch of test images. The images were just a solid color background with solid text of … Read more
I agree with the general consensus that the Foo() && Bar() form is reasonable unless it is the case that Bar() is useful for its side effects as well as its value. If it is the case that Bar() is useful for its side effects as well as it’s value, my first choice would be … Read more
Is it recommended to keep the lines inside the try catch to bare minimum? No. Can’t imagine how you could think that the length of a try block or indeed of any block can have any impact on performance. Does the code inside the try clause run slower or cause any performance hit?. No. As … Read more
You could use the with statement if you have python 2.5 or above: from __future__ import with_statement import contextlib @contextlib.contextmanager def handler(): try: yield except Exception, e: baz(e) Your example now becomes: with handler(): foo(a, b) with handler(): bar(c, d)
I found this post interesting and as an exercise I created this which ONLY does 6 comparisons and NOTHING else: static double MedianOfFive(double a, double b, double c, double d, double e) { return b < a ? d < c ? b < d ? a < e ? a < d ? e … Read more
It looks like a problem of GCC. Intel compiler gives the expected result. $ g++ -I ~/program/include/eigen3 -std=c++11 -O3 a.cpp -o a && ./a test1_us: 200087 test2_us: 320033 test3_us: 44539 $ icpc -I ~/program/include/eigen3 -std=c++11 -O3 a.cpp -o a && ./a test1_us: 214537 test2_us: 23022 test3_us: 42099 Compared to the icpc version, gcc seems to … Read more
Almost identical to NickFitz’s answer: var str = [“” ,”line 1″ ,”line 2″ ,”line 3″ ].join(“”); // str will contain “line1line2line3” The difference, the code is slightly more maintainable because the lines can be re-ordered without regard to where the commas are. No syntax errors.
Implementations use names starting with an underscore followed by an uppercase letter or two underscores to avoid conflicts with user-defined macros. Such names are reserved in C++. For example, one could define a macro called Type and then #include <vector>. If vector implementations used Type as a template parameter name, it would break. However, one … Read more
The basic premise here is false: the size of a try block makes no difference in performance. Performance is affected by actually raising exceptions at runtime, and that’s independent of the size of the try block. However, keeping try blocks small can lead to better programs. You might catch exceptions to recover and proceed, or … Read more