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lenses, fclabels, data-accessor - which library for structure access and mutation is better
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There are at least 4 libraries that I am aware of providing lenses.
The notion of a lens is that it provides something isomorphic to
data Lens a b = Lens (a -> b) (b -> a -> a)
providing two functions: a getter, and a setter
get ...
I want to execute shell commands from Maven's pom.xml
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149
Here's what's been working for me:
<plugin>
<artifactId>exec-maven-plugin</ar...
Preserving signatures of decorated functions
... """Computes x*y + 2*z"""
return x*y + 2*z
print funny_function("3", 4.0, z="5")
# 22
help(funny_function)
# Help on function funny_function in module __main__:
#
# funny_function(x, y, z=3)
# Computes x*y + 2*z
Python 3.4+
functools.wraps() from stdlib preserves signatures since Py...
Explain which gitignore rule is ignoring my file
...ignore manual page. Phew, that was way more work than I expected!
UPDATE 4: If you're interested in the full story about how this answer evolved and the feature came to be implemented, check out episode #32 of the GitMinutes podcast.
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Why switch is faster than if
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DanielDaniel
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6
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What Makes a Method Thread-safe? What are the rules?
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4 Answers
4
Active
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Understanding the Event Loop
... the tick is complete and it can start the event loop algorithm again.
4 The Event Loop is a queue of callback functions. When an async function executes, the callback function is pushed into the queue. The JavaScript engine doesn't start processing the event loop until the code after an async f...
How do you print in a Go test using the “testing” package?
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148
The structs testing.T and testing.B both have a .Log and .Logf method that sound to be what you...