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RabbitMQ and relationship between channel and connection
...plication without overloading the broker with TCP connections.
You can use one Channel for everything. However, if you have multiple threads, it's suggested to use a different Channel for each thread.
Channel thread-safety in Java Client API Guide:
Channel instances are safe for use by multipl...
How can you do anything useful without mutable state?
...ut functional programming lately, and I can understand most of it, but the one thing I just can't wrap my head around is stateless coding. It seems to me that simplifying programming by removing mutable state is like "simplifying" a car by removing the dashboard: the finished product may be simpler...
Why does dividing two int not yield the right value when assigned to double?
...int. In order to use the double version, which returns a double, at least one of the ints must be explicitly casted to a double.
c = a/(double)b;
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Should functions return null or an empty object?
...ctions. Is it better to return a Null or an empty object? And why should one do one over the other?
31 Answers
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How to force 'cp' to overwrite directory instead of creating another one inside?
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just in case anyone is tripped up by this it won't work with OSX cp developer.apple.com/library/mac/documentation/Darwin/Reference/…
– dnfehren
Mar 18 '16 at 19:07
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Check for column name in a SqlDataReader object
... method that builds the same object for multiple stored procedures calls. One of the stored procedures has an additional column that is not used by the other stored procedures. I want to modified the method to accommodate for every scenario.
...
How do I compare two hashes?
...["c", 3]]
Hash[*difference.flatten]
=> {"c"=>3}
Doing it all in one operation and getting rid of the difference variable:
Hash[*(
(hash3.size > hash1.size) \
? hash3.to_a - hash1.to_a \
: hash1.to_a - hash3.to_a
).flatten]
=> {"c"=>3}
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Recursive search and replace in text files on Mac and Linux
...he {} + at the end means that find will append all results as arguments to one instance of the called command, instead of re-running it for each result. (One exception is when the maximal number of command-line arguments allowed by the OS is breached; in that case find will run more than one instanc...
What are the differences between virtual memory and physical memory?
...pecific implementations of virtual memory, most likely paging. There is no one way to do paging - there are many implementations and the one your textbook describes is likely not the same as the one that appears in real OSes like Linux/Windows - there are probably subtle differences.
I could blab a...
Test whether string is a valid integer
...t in a shell script. If the user provided a valid integer, the script does one thing, and if not valid, it does something else. Trouble is, I haven't found an easy (and reasonably elegant) way of doing this - I don't want to have to pick it apart char by char.
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