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Can someone explain the traverse function in Haskell?
I am trying and failing to grok the traverse function from Data.Traversable . I am unable to see its point. Since I come from an imperative background, can someone please explain it to me in terms of an imperative loop? Pseudo-code would be much appreciated. Thanks.
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How to remove old Docker containers
...prune
This will remove all stopped containers and should work on all platforms the same way.
There is also a Docker system prune:
docker system prune
which will clean up all unused containers, networks, images (both dangling and unreferenced), and optionally, volumes, in one command.
For ol...
How to “grep” for a filename instead of the contents of a file?
...has a directory ('/xyz_test_123/other.txt') would also comes to the result set.
cheers
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What does f+++++++++ mean in rsync logs?
...--times). An alternate value of T means that the modification time will be set to the transfer time, which happens when a file/symlink/device is updated without --times and when a symlink is changed and the receiver can’t set its time. (Note: when using an rsync 3.0.0 client, you might see the s f...
How do you get the list of targets in a makefile?
...used rake a bit (a Ruby make program), and it has an option to get a list of all the available targets, eg
20 Answers
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Futures vs. Promises
...it is separated into these two separate "interfaces" is to hide the "write/set" functionality from the "consumer/reader".
auto promise = std::promise<std::string>();
auto producer = std::thread([&]
{
promise.set_value("Hello World");
});
auto future = promise.get_future();
auto con...
How do you loop through each line in a text file using a windows batch file?
...%%i in (myfile.txt) do call :process %%i %%j %%k
goto thenextstep
:process
set VAR1=%1
set VAR2=%2
set VAR3=%3
COMMANDS TO PROCESS INFORMATION
goto :EOF
What this does:
The "do call :process %%i %%j %%k" at the end of the for command passes the information acquired in the for command from myfile.t...
How can I add reflection to a C++ application?
I'd like to be able to introspect a C++ class for its name, contents (i.e. members and their types) etc. I'm talking native C++ here, not managed C++, which has reflection. I realise C++ supplies some limited information using RTTI. Which additional libraries (or other techniques) could supply this ...
Are there any worse sorting algorithms than Bogosort (a.k.a Monkey Sort)? [closed]
...y co-workers took me back in time to my University days with a discussion of sorting algorithms this morning. We reminisced about our favorites like StupidSort , and one of us was sure we had seen a sort algorithm that was O(n!) . That got me started looking around for the "worst" sorting algori...
Unmarshaling nested JSON objects
There are a few questions on the topic but none of them seem to cover my case, thus I'm creating a new one.
8 Answe...