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Applicatives compose, monads don't
...s -> let nmnt = ns >>= (return . f) in ???
we get this far, but now our layers are all jumbled up. We have an n (m (n t)), so we need to get rid of the outer n. As Alexandre C says, we can do that if we have a suitable
swap :: n (m t) -> m (n t)
to permute the n inwards and join it ...
How does the new automatic reference counting mechanism work?
Can someone briefly explain to me how ARC works? I know it's different from Garbage Collection, but I was just wondering exactly how it worked.
...
Most efficient way to store thousand telephone numbers
...ounts and each count is at most 1000. If we omit the last one (because we know it is 1000 anyway), we can store all of these numbers in a contiguous block of (2^m - 1) * 10 bits. (10 bits is enough for storing a number less than 1024.)
The last k bits of all (reduced) phone numbers are stored conti...
Select first row in each GROUP BY group?
...ndex-only scans is in development for Postgres 14. See here and here.)
For now, there are faster query techniques to substitute for this. In particular if you have a separate table holding unique customers, which is the typical use case. But also if you don't:
Optimize GROUP BY query to retrieve la...
Efficient string concatenation in C++
...ly will have much better efficiency simply by using operator += instead.
Now after that disclaimer, I will answer your actual question...
The efficiency of the STL string class depends on the implementation of STL you are using.
You could guarantee efficiency and have greater control yourself by...
Random / noise functions for GLSL
...representation so it should be perfectly portable.
I gave this a try just now. The results are very good: it looks exactly like static with every input I tried, no visible patterns at all. In contrast the popular sin/fract snippet has fairly pronounced diagonal lines on my GPU given the same inpu...
Why does the C# compiler not fault code where a static method calls an instance method?
...w answer (and this entire question) has mostly only historical interest by now!
(Pre C# 7.3:)
For some reason, overload resolution always finds the best match before checking for static versus non-static. Please try this code with all static types:
class SillyStuff
{
static void SameName(obje...
What are the big improvements between guava and apache equivalent libraries?
... lot of great developers have contributed to Guava (even Joshua Bloch, who now works at Google!).
The core philosophies and design choices behind Guava are consistent across the library, and the developers adhere to very good (IMO) API design principles, having learned from past mistakes of the JDK...
XML parsing of a variable string in JavaScript
...uys answer worked fine in my case. What's not decent about that, I do not know.
– eric
Apr 19 '12 at 15:21
...
$on and $broadcast in angular
...
One thing you should know is $ prefix refers to an Angular Method, $$ prefixes refers to angular methods that you should avoid using.
below is an example template and its controllers, we'll explore how $broadcast/$on can help us achieve what we w...