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What's the difference between a catalog and a schema in a relational database?
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@Tim A schema is just a namespace separating groups of tables, like folders are a namespace organizing files in a file system (except no nesting of schemas). Tables store your app’s data as attributes/columns by row.
– Basil Bourque
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Node.js / Express.js - How does app.router work?
...defining our routes.
express.Router() is use multiple times to define groups of routes.
route used as middleware to process requests.
route used as middleware to validate parameters using ".param()".
app.route() used as a shortcut to the Router to define multiple requests on a ro...
What is the use of interface constants?
...y named private interface nested in a class file are also good practice to group all your private constants rather than scatter them all over the file.
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How do you detect Credit card type based on number?
... input. Why? Because it’s typically much easier to enter the digits in groups, similar to how they’re displayed on the front of an actual credit card, i.e.
4444 4444 4444 4444
is much easier to enter correctly than
4444444444444444
There’s really no benefit in chastising the user becau...
Differences between Perl and PHP [closed]
...onsider Perl 5, since Perl 6 is still under development. Some differences, grouped roughly by subject:
Perl has native regular expression support, including regexp literals. PHP uses Perl's regexp functions as an extension.
Perl has quite a few more operators, including matching (=~, !~), quote-li...
What does “abstract over” mean?
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In algebra, as in everyday concept formation, abstractions are formed by grouping things by some essential characteristics and omitting their specific other characteristics. The abstraction is unified under a single symbol or word denoting the similarities. We say that we abstract over the differe...
How do I use reflection to call a generic method?
... name of a method, i.e. "ToString" or "GenericMethod" actually refers to a group of methods that may contain one or more methods. Until you provide the types of the method parameters, it is not known which
method you are referring to.
((Action)GenericMethod<object>) refers to the delegate fo...
How can I pair socks from a pile efficiently?
...t sorting is a little too much: We don't need order; we just need equality groups.
So hashing would be enough (and faster).
For each color of socks, form a pile. Iterate over all socks in your input basket and distribute them onto the color piles.
Iterate over each pile and distribute it by some ...
Why does pthread_cond_wait have spurious wakeups?
...bly correct academic contingent among the "core threadies" in
the working group, though I don't think anyone really disagreed with the intent
once they understood what it meant.
We followed that intent with several levels of justification. The first was that
"religiously" using a loop protects ...
What are good examples of genetic algorithms/genetic programming solutions? [closed]
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I work in a research group where this sort of thing (ALife) was what people did everyday. Your story is totally believable, and to be honest I was a little shocked to see that anyone would think it is a fake. Then again, usually the point of doin...