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Can someone explain the traverse function in Haskell?
... [1..3]?
We get the partial results of [1], [2,2] and [3,3,3] using rep. Now the semantics of lists as Applicatives is "take all combinations", e.g. (+) <$> [10,20] <*> [3,4] is [13,14,23,24].
"All combinations" of [1] and [2,2] are two times [1,2]. All combinations of two times [1,2...
Why does JPA have a @Transient annotation?
...isted. Consider this short example:
public enum Gender { MALE, FEMALE, UNKNOWN }
@Entity
public Person {
private Gender g;
private long id;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public long getId() { return id; }
public void setId(long id) { this.id = id; }
...
Return number of rows affected by UPDATE statements
... OUTPUT INSERTED.* INTO @temp
WHERE
StartTime > '2009 JUL 09'
-- now get the count of affected records
SELECT COUNT(*) FROM @temp
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Is main() really start of a C++ program?
... @AdamDavis: I don't remember what my concern was. I can't think of one now.
– Lightness Races in Orbit
Dec 15 '16 at 21:37
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Grasping the Node JS alternative to multithreading
...y used configurations. Apache is multiprocess, and not multithreaded until now, and will be, probably forever. I find it catastrophal, manipulating the proper meanings of the terminology is only a nice try to hide the problem, instead solving it.
– peterh - Reinstate Monica
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Unicode, UTF, ASCII, ANSI format differences
...e encoded as surrogate pairs. These used to be relatively rarely used, but now many consumer applications will need to be aware of non-BMP characters in order to support emojis.
UTF-8: Variable length encoding, 1-4 bytes per code point. ASCII values are encoded as ASCII using 1 byte.
UTF-7: Usually ...
IIS7 Overrides customErrors when setting Response.StatusCode?
Having a weird problem here. Everybody knows that if you use web.config's customErrors section to make a custom error page, that you should set your Response.StatusCode to whatever is appropriate. For example, if I make a custom 404 page and name it 404.aspx, I could put <% Response.StatusCo...
Why can I use auto on a private type?
...ublic: typedef Bar return_type_from_Baz; to the class Foo in the question. Now the type can be identified by a public name, despite being defined in a private section of the class.
– Steve Jessop
Nov 23 '12 at 16:36
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What does the [Flags] Enum Attribute mean in C#?
...the runtime performance of this, but all the same, I do think its nice to know that this isn't going to be inserting bitshifts anywhere you use the enum. More of a 'that's neat' thing rather than anything related to performance
– Orion Edwards
Feb 15 '13 at 19:...
Why doesn't java.util.Set have get(int index)?
...
Just adding one point that was not mentioned in mmyers' answer.
If I know I want the first item, I can
use set.iterator().next(), but
otherwise it seems I have to cast to
an Array to retrieve an item at a
specific index?
What are the appropriate ways of
retrieving data from a set...