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In Scala, what exactly does 'val a: A = _' (underscore) mean?
...default value of the type A. For example, the default value of an Int is 0 and the default value of a reference type is null.
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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
... a lockfile approach. If you acquire the lock, proceed else show a message and exit.
As an example:
[Terminal #1] $ lockfile -r 0 /tmp/the.lock
[Terminal #1] $
[Terminal #2] $ lockfile -r 0 /tmp/the.lock
[Terminal #2] lockfile: Sorry, giving up on "/tmp/the.lock"
[Terminal #1] $ rm -f /tmp/the....
How to update PATH variable permanently from Windows command line?
If I execute set PATH=%PATH%;C:\\Something\\bin from the command line ( cmd.exe ) and then execute echo %PATH% I see this string added to the PATH. If I close and open the command line, that new string is not in PATH.
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How can I get the concatenation of two lists in Python without modifying either one? [duplicate]
...s: list1 + list2. This gives a new list that is the concatenation of list1 and list2.
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How can I listen for a click-and-hold in jQuery?
...ave', function() {
clearTimeout(timeoutId);
});
Edit: correction per AndyE...thanks!
Edit 2: using bind now for two events with same handler per gnarf
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How to sort an IEnumerable
... .ToList();
or (if you want to later add more items to the list and keep it sorted)
_components = xml.Descendants("component")
.Select(c => (string)c)
.Distinct()
.ToList();
_components.Add("foo");
_components.Sort();
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How to create a directory if it doesn't exist using Node.js?
...rectory if it doesn't exist.
It should have full permission for the script and readable by others.
17 Answers
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What is the Python equivalent of static variables inside a function?
...e problem with the first approach is it isn't immediately obvious that foo and foo.counter = are intimately related. however, I ultimately prefer the decorator approach, as there's no way the decorator will not be called and it is semantically more obvious what it does (@static_var("counter", 0) is...
When to use dynamic vs. static libraries
...ing a class library in C++, you can choose between dynamic ( .dll , .so ) and static ( .lib , .a ) libraries. What is the difference between them and when is it appropriate to use which?
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Perforce for Git users? [closed]
...ore information on that can be found at: https://git.wiki.kernel.org/index.php/GitP4
Still here? Good, let's look at Perforce.
Some Terminology Differences to Sort Out
Before we get into the details we need to briefly cover a couple terminology differences between Git and Perforce.
The first is ...