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What's the difference between a continuation and a callback?
...on called call-with-current-continuation which is often abbreviated as callcc. Unfortunately callcc can't be fully implemented in JavaScript, but we could write a replacement function for most of its use cases:
pythagoras(3, 4, console.log);
function pythagoras(x, y, cont) {
var x_squar...
How to select a node using XPath if sibling node has a specific value?
...matching the predicate from <a/>'s predicate:
//a[bb/text() = "zz"]/cc/text()
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How to parse JSON in Scala using standard Scala classes?
...his is a solution based on extractors which will do the class cast:
class CC[T] { def unapply(a:Any):Option[T] = Some(a.asInstanceOf[T]) }
object M extends CC[Map[String, Any]]
object L extends CC[List[Any]]
object S extends CC[String]
object D extends CC[Double]
object B extends CC[Boolean]
val ...
How to get the number of characters in a std::string?
...r string types in non-standard C++ libraries, such as MFC's CString, ATL's CComBSTR, ACE's ACE_CString, and so on, with methods such as .GetLength(), and so on. I can't remember the specifics of them all right off the top of my head.
The STLSoft libraries have abstracted this all out with what they...
Scala: Abstract types vs generics
...o by hand. Besides the loss in conciseness, there is also the problem of accidental name
conflicts between abstract type names that emulate type parameters.
Second, generics and abstract types usually serve distinct roles in Scala programs.
Generics are typically used when one needs just type ...
Payment Processors - What do I need to know if I want to accept credit cards on my website? [closed]
...cost, but I'm looking for the answer to what do I need to do if I want to accept credit card payments?
9 Answers
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What is the best regular expression to check if a string is a valid URL?
...x convenience functions (character class, non-capturing group) */
function cc($str, $suffix = '', $negate = false) {
return '[' . ($negate ? '^' : '') . $str . ']' . $suffix;
}
function ncg($str, $suffix = '') {
return '(?:' . $str . ')' . $suffix;
}
/* Preserved from RFC3986 */
$ALPHA = '...
Can't install Ruby under Lion with RVM – GCC issues
...rt for clang, so if you are installing such a version you should not need GCC. If you’re installing an older version of Ruby, read on.
To compile Ruby with GCC, you need a non-LLVM version of GCC, which is no longer included with XCode 4.2. Install it yourself (or downgrade to XCode 4.1 temporari...
“CASE” statement within “WHERE” clause in SQL Server 2008
...tered LIKE '%TestPerson' THEN 1 ELSE 0 END
END = 1
AND cc.ccnum = CASE LEN('TestFFNum')
WHEN 0 THEN cc.ccnum
ELSE 'TestFFNum'
END
AND CASE LEN('2011-01-09 11:56:29.327')
WHE...
Remove by _id in MongoDB console
...close. This will work:
db.test_users.deleteOne( {"_id": ObjectId("4d512b45cc9374271b02ec4f")});
i.e. you don't need a new for the ObjectId.
Also, note that in some drivers/tools, remove() is now deprecated and deleteOne or deleteMany should be used instead.
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