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LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
...important difference is that if you use SingleOrDefault on a sequence with more than one element, it throws an exception.
– Kamran Bigdely
Oct 5 '14 at 16:55
18
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Can I have multiple :before pseudo-elements for the same element?
...n have both a :before and an :after pseudo-element — it just cannot have more than one of each kind.)
As a result, when you have multiple :before rules matching the same element, they will all cascade and apply to a single :before pseudo-element, as with a normal element. In your example, the end...
Why main does not return 0 here?
... eax register. See en.wikipedia.org/wiki/X86_calling_conventions#cdecl for more information.
– Sylvain Defresne
Dec 30 '11 at 10:04
2
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What is the order of precedence for CSS?
...s ( html style attribute ) overrides css rules in style tag and css file
a more specific selector takes precedence over a less specific one
rules that appear later in the code override earlier rules if both have the same specificity.
A css rule with !important always takes precedence.
In your case...
Best practice for storing and protecting private API keys in applications [closed]
...eaningless names, where ever possible. Extracting the keys then takes some more time, for figuring out which string serves which purpose.
Note that setting up ProGuard shouldn't be as difficult as you fear. To begin with, you only need to enable ProGuard, as documented in project.properties. If the...
Unique combination of all elements from two (or more) vectors
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is someone with more rep than me able to accept this answer?
– Josh
Aug 26 '19 at 20:29
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How can I know if a process is running?
...ways put curly braces, since there's always a chance you might have to add more statements there in the future, in which case the braces will already be there when you need them. But for things like this, if you are 100% sure you only need one statement, it's okay to do and syntactically valid.
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Is there a way for multiple processes to share a listening socket?
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You can share a socket between two (or more) processes in Linux and even Windows.
Under Linux (Or POSIX type OS), using fork() will cause the forked child to have copies of all the parent's file descriptors. Any that it does not close will continue to be shared, ...
How to generate random SHA1 hash to use as ID in node.js?
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243,583,606,221,817,150,598,111,409x more entropy
I'd recommend using crypto.randomBytes. It's not sha1, but for id purposes, it's quicker, and just as "random".
var id = crypto.randomBytes(20).toString('hex');
//=> f26d60305dae929ef8640a75e70dd78ab809cfe9
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Open document with default OS application in Python, both in Windows and Mac OS
...['open', filename])
In Python 3.5+ you can equivalently use the slightly more complex but also somewhat more versatile
subprocess.run(['open', filename], check=True)
If you need to be compatible all the way back to Python 2.4, you can use subprocess.call() and implement your own error checking:...