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Ruby custom error classes: inheritance of the message attribute
...hing similar. I wanted to pass an object to #new and have the message set based on some processing of the passed object. The following works.
class FooError < StandardError
attr_accessor :message # this is critical!
def initialize(stuff)
@message = stuff.reverse
end
end
begin
rais...
What is the Scala identifier “implicitly”?
...e you are calling a method that pretty prints a person, using a type class based approach:
trait Show[T] { def show(t: T): String }
object Show {
implicit def IntShow: Show[Int] = new Show[Int] { def show(i: Int) = i.toString }
implicit def StringShow: Show[String] = new Show[String] { def show...
Latest jQuery version on Google's CDN
...
nice to learn that caching is based on the version detail level!
– Tadas V.
Oct 6 '16 at 8:06
add a comment
| ...
Unknown file type MIME?
...egarding the content or state of the file, or even if it is binary or text based, it is too obscure for production code, might be ok for a small project, since if a file mimetype has no handler in the OS, it is essentially a downloadable binary- and the unknown type is a known handle in windows OS, ...
What is the maximum amount of RAM an app can use?
...get the amount of memory allocated to your app, it's calculated on the fly based on various factors.
P.S. I'm using a static class field to hold a cache but as per the latest Android guidelines its recommended to use ViewModel architecture component for that purpose.
...
Cluster analysis in R: determine the optimal number of clusters
...t;- Mclust(as.matrix(d), G=1:20)
m.best <- dim(d_clust$z)[2]
cat("model-based optimal number of clusters:", m.best, "\n")
# 4 clusters
plot(d_clust)
Five. Affinity propagation (AP) clustering, see http://dx.doi.org/10.1126/science.1136800
library(apcluster)
d.apclus <- apcluster(negDist...
Performance difference for control structures 'for' and 'foreach' in C#
...the lists indexer is implemented. As it turns out the enumerator for types based on arrays are normally written something like this:
private static IEnumerable<T> MyEnum(List<T> list)
{
for (int i = 0; i < list.Count; i++)
{
yield return list[i];
}
}
So as you c...
JPA: How to have one-to-many relation of the same Entity type
...I had some extensive business logic around hierarchical structure and JPA (based on relational model) is very weak to support it I introduced interface IHierarchyElement and entity listener HierarchyListener:
public interface IHierarchyElement {
public String getNodeId();
public IHierarch...
What is the difference between a process and a thread?
...rches of terms I use they don't understand, can't they, until they reach a base point they do understand. I was going to suggest you offer your own answer, but am happy to see you already have.
– Scott Langham
Jul 6 '16 at 20:48
...
Creating an index on a table variable
...t first.
SQL Server 2014
In addition to the methods of adding constraint based indexes discussed below SQL Server 2014 also allows non unique indexes to be specified directly with inline syntax on table variable declarations.
Example syntax for that is below.
/*SQL Server 2014+ compatible inlin...