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Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
...inclusively. Those created using ... exclude the end value.
So a..b is like a <= x <= b, whereas a...b is like a <= x < b.
Note that, while to_a on a Range of integers gives a collection of integers, a Range is not a set of values, but simply a pair of start/end values:
(1..5).incl...
How do you 'redo' changes after 'undo' with Emacs?
...ndo will undo the undo, resulting in a redo.
Longer version:
You can think of undo as operating on a stack of operations. If you perform some command (even a navigation command such as C-f) after a sequence of undo operations, all the undos are pushed on to the operation stack. So the next undo u...
How to create SBT project with IntelliJ Idea?
I just got started with Scala/LiftWeb/Sbt developing, and I'd like to import a Sbt project in IntelliJ Idea.
Actually, I managed to import my project in two different ways:
...
iPhone/iOS JSON parsing tutorial [closed]
As a learning experience, I want to make an iPhone application that calls a webserver/webservice, retrieves a JSON response, and uses that response to populate the rows of a UITableView (assuming it converts the JSON into an NSArray first).
...
Check whether an array is empty [duplicate]
...ts in array and this definitely doesn't mean that array is empty. As a quick workaround you can do following:
$errors = array_filter($errors);
if (!empty($errors)) {
}
array_filter() function's default behavior will remove all values from array which are equal to null, 0, '' or false.
Otherwise...
Get div height with plain JavaScript
...
DanDan
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Which is preferred: Nullable.HasValue or Nullable != null?
I always used Nullable<>.HasValue because I liked the semantics. However, recently I was working on someone else's existing codebase where they used Nullable<> != null exclusively instead.
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Stylecop vs FXcop
...
Stylecop is a style analysis tool that works at the source code level. It exists primarily to provide a single common style that managed projects can use to remain consistent within the larger world of managed software. It makes decisions regarding style primarily ...
Why does Eclipse Java Package Explorer show question mark on some classes?
In the Eclipse Helios Java Package Explorer, I see the Java class icons display a small question mark to the right of the 'J', something like [J?]. This icon is shown on each class within one package in my project, but I cannot find an explanation for this in the documentation.
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Shell script to delete directories older than n days
...Explanation:
find: the unix command for finding files / directories / links etc.
/path/to/base/dir: the directory to start your search in.
-type d: only find directories
-ctime +10: only consider the ones with modification time older than 10 days
-exec ... \;: for each such result found, do the fo...