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Creating an empty list in Python
... Why does list('') give [] instead of ['']?
– Chris_Rands
Sep 20 '18 at 10:18
This is because this func make list from...
Type erasure techniques
... erasure techniques in C++ are done with function pointers (for behaviour) and void* (for data). The "different" methods simply differ in the way they add semantic sugar. Virtual functions, e.g., are just semantic sugar for
struct Class {
struct vtable {
void (*dtor)(Class*);
vo...
Immediate Child selector in LESS
...>.control {
...
}
}
Note the lack of space between ">" and ".", otherwise it won't work.
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Is there a standard sign function (signum, sgn) in C/C++?
I want a function that returns -1 for negative numbers and +1 for positive numbers.
http://en.wikipedia.org/wiki/Sign_function
It's easy enough to write my own, but it seems like something that ought to be in a standard library somewhere.
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做了个购物清单App后，我才真正搞懂App Inventor 2的变量 - App应用开发 - ...
...例，欢迎访问 App Inventor 2 中文网
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In SQL, how can you “group by” in ranges?
... as [number of occurences]
from (
select case
when score between 0 and 9 then ' 0- 9'
when score between 10 and 19 then '10-19'
else '20-99' end as range
from scores) t
group by t.range
or
select t.range as [score range], count(*) as [number of occurrences]
from (
select use...
What is the best way to get all the divisors of a number?
...e dumb way (stopping at n/2) very cool, thank you!
– Andrea Ambu
Oct 5 '08 at 10:20
47
For those ...
Remove duplicates from an array of objects in JavaScript
...alculating it on every iteration. Assign it to a variable outside the loop and pass the variable instead of the things.thing.length.
– 0v3rth3d4wn
Aug 26 '14 at 12:56
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Why would you use Expression rather than Func?
I understand lambdas and the Func and Action delegates. But expressions
stump me.
10 Answers
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What is the use of the ArraySegment class?
...
ArraySegment<T> has become a lot more useful in .NET 4.5+ and .NET Core as it now implements:
IList<T>
ICollection<T>
IEnumerable<T>
IEnumerable
IReadOnlyList<T>
IReadOnlyCollection<T>
as opposed to the .NET 4 version which implemented no interfaces...