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How to determine if a number is a prime with regex?
...mitted for clarity), the above regex is identical to the original.
More fun regex
The following regex uses similar technique; it should be educational:
System.out.println(
"OhMyGod=MyMyMyOhGodOhGodOhGod"
.replaceAll("^(.+)(.+)(.+)=(\\1|\\2|\\3)+$", "$1! $2! $3!")
); // prints "Oh! M...
Why and How to avoid Event Handler memory leaks?
...ds a reference to object B, then, it will mean, object A needs object B to function, right? So, the garbage collector won't collect the object B as long as the object A is alive in the memory.
I think this part should be obvious to a developer.
+= Means, injecting reference of Right side object to...
Is it better to specify source files with GLOB or each file individually in CMake?
...ifftool files are stored as $basename.$ext.$type.$pid.$ext which can cause fun errors when trying to compile after a single merge resolution.
– mathstuf
Mar 4 '13 at 21:43
9
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What is the formal difference in Scala between braces and parentheses, and when should they be used?
What is the formal difference between passing arguments to functions in parentheses () and in braces {} ?
9 Answers
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What are free monads?
...re accessible explanation.
Free monads are just a general way of turning functors into monads. That is, given any functor f Free f is a monad. This would not be very useful, except you get a pair of functions
liftFree :: Functor f => f a -> Free f a
foldFree :: Functor f => (f r -> ...
在 App Inventor 2 中使用图像 · App Inventor 2 中文网
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What does Ruby have that Python doesn't, and vice versa?
..., 2, 3, 4].each{ |e| puts e + 5 }
> [6, 7, 8, 9]
Python has anonymous functions/closures/lambdas, but it doesn't quite have blocks since it's missing some of the useful syntactic sugar. However, there's at least one way to get it in an ad-hoc fashion. See, for example, here.
...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
... so counter-intuitive, though it does have one very important application: functions.
trait Function1[-P, +R] {
def apply(p: P): R
}
Notice the "-" variance annotation on the P type parameter. This declaration as a whole means that Function1 is contravariant in P and covariant in R. Thus, we ...
What is the most efficient/elegant way to parse a flat table into a tree?
...g with this data to display a tree, I created a tree_item_iterator utility function which, for each node, should give you sufficient information to generate whatever kind of display you want.
More info about MPTT:
Trees in SQL
Storing Hierarchical Data in a Database
Managing Hierarchical Data in ...
Why should I not include cpp files and instead use a header?
...o when you include all the source files in your project together, there is fundamentally no difference between what you've done, and just making one huge source file without any separation at all.
"Oh, that's no big deal. If it runs, it's fine," I hear you cry. And in a sense, you'd be correct. ...