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Naming conventions for abstract classes
...eBase , System.Configuration.ConfigurationValidatorBase , System.Windows.Forms.ButtonBase , and, of course, System.Collections.CollectionBase .
...
What does “coalgebra” mean in the context of programming?
...= mappend (a, b)
op (Right ()) = mempty
We can actually use this transformation repeatedly to combine all the τⁿ → τ functions into a single one, for any algebra. (In fact, we can do this for any number of functions a → τ, b → τ and so on for any a, b,….)
This lets us talk about ...
Obfuscated C Code Contest 2006. Please explain sykes2.c
... 2-3 3
1 0-1 7
0 6-7 4
0 4-5 4
0 2-3 3
0 0-1 7
or in tabular form
00005577
11775577
11775577
11665577
22773377
22773377
44443377
Note that the author used the null terminator for the first two table entries (sneaky!).
This is designed after a seven-segment display, with 7s as blank...
What is sharding and why is it important?
...y, rather than splitting by columns (as for normalization). Each partition forms part of a shard, which may in turn be located on a separate database server or physical location. The advantage is the number of rows in each table is reduced (this reduces index size, thus improves search performance)....
“Inner exception” (with traceback) in Python?
...s thrown I typically want to wrap it in another exception that adds more information, while still showing the full stack trace. It's quite easy in C#, but how do I do it in Python?
...
Is it possible to hide extension resources in the Chrome web inspector network tab?
...us, incognito windows won't remember any login details or autocomplete any form inputs, both of which are features I really need when testing web interfaces. You can stop any extension resources appearing easily enough by just creating a fresh user profile with no extensions installed (and you'll s...
How to make an HTTP POST web request
...
There are several ways to perform HTTP GET and POST requests:
Method A: HttpClient (Preferred)
Available in: .NET Framework 4.5+, .NET Standard 1.1+, .NET Core 1.0+ .
It is currently the preferred approach, and is asynchronous and high performance. ...
Difference between return and exit in Bash functions
...tly executed foreground pipeline." That exit may be from the shell in the form of a call to exit (or hitting the end of the script) or in the form of a call to return within a function.
– SiegeX
Dec 12 '10 at 1:58
...
How to loop through a HashMap in JSP?
...t;c:forEach items="${partnerTypesMap}" var="partnerTypesMap">
<form:option value="${partnerTypesMap['value']}">${partnerTypesMap['key']}</form:option>
</c:forEach>
share
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SQLite - UPSERT *not* INSERT or REPLACE
...author
FROM new LEFT JOIN page AS old ON new.name = old.name;
The exact form of this query can vary a bit. The key is the use of INSERT SELECT with a left outer join, to join an existing row to the new values.
Here, if a row did not previously exist, old.id will be NULL and SQLite will then assi...