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How to deal with a slow SecureRandom generator?
If you want a cryptographically strong random numbers in Java, you use SecureRandom . Unfortunately, SecureRandom can be very slow. If it uses /dev/random on Linux, it can block waiting for sufficient entropy to build up. How do you avoid the performance penalty?
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How to link to part of the same document in Markdown?
I am writing a large Markdown document and would like to place a table of contents of sorts at the beginning that will provide links to various locations in the document. How can I do this?
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In Python script, how do I set PYTHONPATH?
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You don't set PYTHONPATH, you add entries to sys.path. It's a list of directories that should be searched for Python packages, so you can just append your directories to that list.
sys.path.append('/path/to/whatever')
In fact,...
Print text instead of value from C enum
... C standard requires compilers to begin enumerations from 0, although most do (I'm sure someone will comment to confirm or deny this).
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Best practices/performance: mixing StringBuilder.append with String.concat
...xplanation; that's what I really needed.
– Nick Rolando
Apr 9 '12 at 20:07
12
Although newer vers...
Bash: Strip trailing linebreak from output
...ific, wc -l < log.txt ), the output contains a linebreak after it. How do I get rid of it?
7 Answers
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How do ports work with IPv6?
Conventional IPv4 dotted quad notation separates the address from the port with a colon, as in this example of a webserver on the loopback interface:
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How to skip over an element in .map()?
...skip
}
return true;
}).map(function(img) { return img.src; });
If you don't want to do that, which is not unreasonable since it has some cost, you can use the more general .reduce(). You can generally express .map() in terms of .reduce:
someArray.map(function(element) {
return transform(eleme...
How to stop/terminate a python script from running?
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This method worked on my windows laptop, but on my linux desktop, it showed ^C in the terminal and the system monitor showed python is still using a lot of CPU...
– user3768495
Nov 29 '15 at 17:15
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How do you concatenate Lists in C#?
...cat returns an IEnumerable<T> that is the two lists put together, it doesn't modify either existing list. Also, since it returns an IEnumerable, if you want to assign it to a variable that is List<T>, you'll have to call ToList() on the IEnumerable<T> that is returned.
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