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What is the best Battleship AI?
... Actually, this answer is nice because it shows in a very concise form the API's you'd need to implement to compete... :)
– dicroce
Oct 27 '09 at 15:51
1
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Parameterize an SQL IN clause
...rs.AddWithValue("@tags", string.Join("|", tags);
}
Two caveats:
The performance is terrible. LIKE "%...%" queries are not indexed.
Make sure you don't have any |, blank, or null tags or this won't work
There are other ways to accomplish this that some people may consider cleaner, so please kee...
Java inner class and static nested class
...r class definition and its single instantiation into one convenient syntax form, and it would also be nice if we didn't have to think up a name for the class (the fewer unhelpful names your code contains, the better). An anonymous inner class allows both these things:
new *ParentClassName*(*constru...
What is the purpose of setting a key in data.table?
...operations, setkey() was never an absolute requirement. That is, we can perform a cold-by or adhoc-by.
## "cold" by
require(data.table)
DT <- data.table(x=rep(1:5, each=2), y=1:10)
DT[, mean(y), by=x] # no key is set, order of groups preserved in result
However, prior to v1.9.6, joins of the ...
WebSockets protocol vs HTTP
...on handshakes, but with a WebSocket connection the initial handshake is performed once and then small messages only have 6 bytes of overhead (2 for the header and 4 for the mask value). The latency overhead is not so much from the size of the headers, but from the logic to parse/handle/store those h...
How do I create a simple 'Hello World' module in Magento?
...er possible, try to use the model objects the system provides to get the information you need. I know it's all there in the SQL tables, but it's best not to think of grabbing data using raw SQL queries, or you'll go mad.
Final disclaimer. I've been using Magento for about two or three weeks, so cav...
Big O, how do you calculate/approximate it?
...takes my students a couple of months to finally grasp. You can find more information on the Chapter 2 of the Data Structures and Algorithms in Java book.
There is no mechanical procedure that can be used to get the BigOh.
As a "cookbook", to obtain the BigOh from a piece of code you first need t...
What does “dereferencing” a pointer mean?
...ases, or undergo zero initialisation (e.g. new T(); and new T(x, y, z); perform zero-initialisation on T's members including pointers, whereas new T; does not).
Further, when you assign 0, NULL and nullptr to a pointer the bits in the pointer are not necessarily all reset: the pointer may not conta...
Why do we copy then move?
...to str, and that will eventually be moved into data. No copying will be performed. If you pass an lvalue, on the other hand, that lvalue will be copied into str, and then moved into data.
So to sum it up, two moves for rvalues, one copy and one move for lvalues.
What would be the reason for the...
How do you parse and process HTML/XML in PHP?
How can one parse HTML/XML and extract information from it?
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