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When to use in vs ref vs out
Someone asked me the other day when they should use the parameter keyword out instead of ref . While I (I think) understand the difference between the ref and out keywords (that has been asked before ) and the best explanation seems to be that ref == in and out , what are some (hypothet...
Why doesn't Python have a sign function?
... return in all the edge cases (+/-0, +/-nan, etc)
So they decided to implement only copysign, which (although more verbose) can be used to delegate to the end user the desired behavior for edge cases - which sometimes might require the call to cmp(x,0).
I don't know why it's not a built-in, but ...
Javascript reduce on array of objects
Say I want to sum a.x for each element in arr .
15 Answers
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Groovy: what's the purpose of “def” in “def x = 0”?
...code (taken from the Groovy Semantics Manual page ), why prefix the assignment with the keyword def ?
6 Answers
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What is the Invariant Culture?
...rate the usage of the Invariant Culture ? I don't understand what the documentation describes.
5 Answers
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Why is creating a new process more expensive on Windows than Linux?
...ss on a Windows box is more expensive than on Linux. Is this true? Can somebody explain the technical reasons for why it's more expensive and provide any historical reasons for the design decisions behind those reasons?
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Do I set properties to nil in dealloc when using ARC?
...ong answer: You should never nil out properties in dealloc, even in manual memory management.
In MRR, you should release your ivars. Nilling out properties means calling setters, which may invoke code that it shouldn't touch in dealloc (e.g. if your class, or a subclass, overrides the setter). Simi...
How to use single storyboard uiviewcontroller for multiple subclass
... to create additional storyboards. Say these views will have exactly the same interface but with root view controller of class SpecificViewController1 and SpecificViewController2 which are subclasses of BasicViewController .
Those 2 view controllers would have the same functionality and inter...
Regular expression for first and last name
For website validation purposes, I need first name and last name validation.
23 Answers
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Control the size of points in an R scatterplot?
In R, the plot() function takes a pch argument that controls the appearance of the points in the plot. I'm making scatterplots with tens of thousands of points and prefer a small, but not too small dot. Basically, I find pch='.' to be too small, but pch=19 to be too fat. Is there somethin...