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What's the difference between “groups” and “captures” in .NET regular expressions?
...istory tracker. When the regex makes his match, it goes through the string from left to right (ignoring backtracking for a moment) and when it encounters a matching capturing parentheses, it will store that in $x (x being any digit), let's say $1.
Normal regex engines, when the capturing parenthes...
A better similarity ranking algorithm for variable length strings
... version of the algorithm and below I wrote a PL/Ruby version of it (taken from the plain ruby version done in the related forum entry comment by Mark Wong-VanHaren) so that I can use it in my PostgreSQL queries:
CREATE FUNCTION string_similarity(str1 varchar, str2 varchar)
RETURNS float8 AS '
str...
JavaScript: What are .extend and .prototype used for?
...nction that copies the prototype of a new subclass that you want to extend from the base class.
So you can do something like:
extend( Fighter, Human )
And the Fighter constructor/object will inherit the prototype of Human, so if you define methods such as live and die on Human then Fighter will ...
How do I prevent the modification of a private field in a class?
... @Svish I should’ve been more drastic: if you return an array from an API function you’re doing it wrong. In private functions inside a library it might be right. In an API (where protection against modifiability plays a role), it never is.
– Konrad Rudolph
...
How do I run a simple bit of code in a new thread?
...thin
ProgressChanged or
RunWorkerCompleted handlers.
However, updating GUI from DoWork
will cause
InvalidOperationException.
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Get value from SimpleXMLElement Object
I have something like this:
12 Answers
12
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Speed up the loop operation in R
... names.
So how better is it?
I run each function for data.frame with nrow from 1,000 to 10,000 by 1,000 and measure time with system.time
X <- as.data.frame(matrix(sample(1:10, n*9, TRUE), n, 9))
system.time(dayloop2(X))
Result is
You can see that your version depends exponentially from nr...
Why no generics in Go?
...ow compilers are caused by C++ like generics and slow execution times stem from the boxing-unboxing approach that Java uses.
The fourth possibility not mentioned in the blog is going the C# route. Generating the specialized code like in C++, but at runtime when it is needed. I really like it, but G...
Making a property deserialize but not serialize with json.net
...the config object into a JObject, then simply remove the unwanted property from the JSON before writing it out. It's just a couple of extra lines of code.
JObject jo = JObject.FromObject(config);
// remove the "ObsoleteSetting" JProperty from its parent
jo["ObsoleteSetting"].Parent.Remove();
jso...
How do I kill background processes / jobs when my shell script exits?
...p 'kill $(jobs -p)' EXIT
Watch out to use single ', to prevent the shell from substituting the $() immediately.
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