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How to count the number of set bits in a 32-bit integer?
...
This is known as the 'Hamming Weight', 'popcount' or 'sideways addition'.
The 'best' algorithm really depends on which CPU you are on and what your usage pattern is.
Some CPUs have a single built-in instruction to do it and others hav...
What are type lambdas in Scala and what are their benefits?
... point[A](a: A): M[A]
def bind[A, B](m: M[A])(f: A => M[B]): M[B]
}
Now, Either is a type constructor of two arguments, but to implement Monad, you need to give it a type constructor of one argument. The solution to this is to use a type lambda:
class EitherMonad[A] extends Monad[({type λ[...
Determine what attributes were changed in Rails after_save callback?
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I think after_update is deprecated now? Anyway, I tried this in an after_save hook and that seemed to work fine. (The changes() hash still hasn't been reset yet in an after_save, apparently.)
– Tyler Rick
Mar 14 '13 at 5:...
Creating functions in a loop
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how do you know how to fix these things?
– alwbtc
Aug 18 '18 at 15:49
3
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Recursive file search using PowerShell
...ion. If you want to search for a file with a certain extension, but don't know the name of the file, you can use:
dir -Path C:\FolderName -Filter *.fileExtension -Recurse | %{$_.FullName}
Or vice versa:
dir -Path C:\FolderName -Filter FileName.* -Recurse | %{$_.FullName}
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Comparing mongoose _id and strings
...latko all these years later, and guess what. I prefer your version to mine now. mind if i add it to my answer with proper attribution?
– r3wt
Apr 4 '18 at 3:40
1
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How do I copy items from list to list without foreach?
...<Student> lstStudent = db.Students.Where(s => s.DOB < DateTime.Now).ToList().CopyList();
Method:
public static List<T> CopyList<T>(this List<T> lst)
{
List<T> lstCopy = new List<T>();
foreach (var item in lst)
{
us...
Why is semicolon allowed in this python snippet?
...limit statements if you wish to put multiple statements on the same line.
Now, why is this allowed? It's a simple design decision. I don't think Python needs this semi-colon thing, but somebody thought it would be nice to have and added it to the language.
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AttributeError: 'module' object has no attribute 'tests'
...ews.py) was still trying to import the deleted model.
When I took out the now-obsolete import statement, problem solved.
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Sequelize.js: how to use migrations and sync
...isten(3000);
// do your stuff
});
});
I can't try this right now, but at first look it should work.
UPD Apr. 2016
After a year, still useful, so sharing my current tips. For now, I'm installing sequelize-cli package as required live dependancy, and then modify NPM startup scripts in ...