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What is more efficient: Dictionary TryGetValue or ContainsKey+Item?
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Why don't you test it?
But I'm pretty sure that TryGetValue is faster, because it only does one lookup. Of course this isn't guaranteed, i.e. different implementations might have different performance characteristics.
The way I'd impleme...
Aborting a shell script if any command returns a non-zero value?
...value. A simple command is any command not part of an if, while, or until test, or part of an && or || list.
See the bash(1) man page on the "set" internal command for more details.
I personally start almost all shell scripts with "set -e". It's really annoying to have a script stubbornl...
Computed / calculated / virtual / derived columns in PostgreSQL
...s are pretty much useless (without huge code changes to a codebase with no test cases) when migrating from oracle to postgres. Are there any solutions from the migration perspective ?
– happybuddha
Oct 3 '16 at 0:41
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HTTP status code 0 - Error Domain=NSURLErrorDomain?
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any source code is applicable to test first two points, you just need an ajax based request. but the 3rd one is happening on canceling the user request, this can be done by abort function in jquery.
– Hariprasath Yadav
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Is it possible to animate scrollTop with jQuery?
...(Might not work for overflow-y:hidden, and overflow:hidden, but I have not tested.
– collinhaines
Jun 9 '15 at 15:02
1
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Iterating C++ vector from the end to the beginning
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@colin Egads! that ugly!. You are testing reversed four times -- two of them inside a loop. Of course, testing a boolean is very fast, but still, why to work you don't have to? Especially, since the only purpose seems to be to make the code unreadable. how...
How to convert wstring into string?
... The above code gives (as copied) gives me a *** glibc detected *** test: malloc(): smallbin double linked list corrupted: 0x000000000180ea30 *** on linux 64-bit (gcc 4.7.3). Anybody else experiencing this?
– hogliux
Nov 10 '13 at 12:22
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How to round a number to significant figures in Python
...es, you can use:
print('{:g}'.format(float('{:.{p}g}'.format(i, p=n))))
Test:
a = [1234, 0.12, 0.012, 0.062, 6253, 1999, -3.14, 0., -48.01, 0.75]
b = ['{:g}'.format(float('{:.1g}'.format(i))) for i in a]
# b == ['1000', '0.1', '0.01', '0.06', '6000', '2000', '-3', '0', '-50', '0.8']
Note: with...
Remove trailing zeros
...atch out for values like 0.000001. G29 format will present them in the shortest possible way so it will switch to the exponential notation. string.Format("{0:G29}", decimal.Parse("0.00000001",System.Globalization.CultureInfo.GetCultureInfo("en-US"))) will give "1E-08" as the result.
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moving committed (but not pushed) changes to a new branch after pull
...anch, perform these steps:
git log
git diff {previous to last commit} {latest commit} > your_changes.patch
git reset --hard origin/{your current branch}
git checkout -b {new branch}
git apply your_changes.patch
I can imagine that there is a simpler approach for steps one and two.
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