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Implications of foldr vs. foldl (or foldl')
...or foldl f x ys looks like
f (... (f (f x y1) y2) ...) yk
An important difference here is that if the result of f x y can be computed using only the value of x, then foldr doesn't' need to examine the entire list. For example
foldr (&&) False (repeat False)
returns False whereas
fold...
SQL JOIN - WHERE clause vs. ON clause
...oins .
The answer may be related (or even the same) but the question is different.
18 Answers
...
Maximum call stack size exceeded error
...nction a(x) {
// The following condition
// is the base case.
if ( ! x) {
return;
}
a(--x);
})(10);
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How do I dump the data of some SQLite3 tables?
...g other than a comma.
.headers on
.out file.csv
select * from MyTable;
If you want to reinsert into a different SQLite database then:
.mode insert <target_table_name>
.out file.sql
select * from MyTable;
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log4net not working
... you actually called
XmlConfigurator.Configure()
anywhere in your code? If the xml snippet above is in the application configuration file, this call will do the trick. If the xml snippet is in it's own file, you'll need to use the .Configure(string) overload that takes the path to the file. Witho...
What is the MySQL VARCHAR max size?
... Column Count and Row Size.
Maximum size a single column can occupy, is different before and after MySQL 5.0.3
Values in VARCHAR columns are variable-length strings. The length can be specified as a value from 0 to 255 before MySQL 5.0.3, and 0 to 65,535 in 5.0.3 and later versions. The effect...
How can I pass command-line arguments to a Perl program?
...
Depends on what you want to do. If you want to use the two arguments as input files, you can just pass them in and then use <> to read their contents.
If they have a different meaning, you can use GetOpt::Std and GetOpt::Long to process them easily. ...
Objective-C parse hex string to integer
...ect, however the 0x prefix is optional when scanning hexadecimal integers. If you have a string in the format #01FFFFAB, you can still use NSScanner, but you can skip the first character.
unsigned result = 0;
NSScanner *scanner = [NSScanner scannerWithString:@"#01FFFFAB"];
[scanner setScanLocatio...
How to show soft-keyboard when edittext is focused
...ant to automatically show the soft-keyboard when an EditText is focused (if the device does not have a physical keyboard) and I have two problems:
...
How to affect other elements when one element is hovered
...
If the cube is directly inside the container:
#container:hover > #cube { background-color: yellow; }
If cube is next to (after containers closing tag) the container:
#container:hover + #cube { background-color: yellow;...