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Scala @ operator
...ble. Consider the following, for instance:
val o: Option[Int] = Some(2)
You can easily extract the content:
o match {
case Some(x) => println(x)
case None =>
}
But what if you wanted not the content of Some, but the option itself? That would be accomplished with this:
o match {
ca...
How to sleep for five seconds in a batch file/cmd [duplicate]
...capture the screen after five seconds, such as taking an image being displayed by the webcam. (Run the script and smile at the camera, for example.)
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Multiple arguments vs. options object
When creating a JavaScript function with multiple arguments, I am always confronted with this choice: pass a list of arguments vs. pass an options object.
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What is the Java ?: operator called and what does it do?
I have been working with Java a couple of years, but up until recently I haven't run across this construct:
16 Answers
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List comprehension: Returning two (or more) items for each item
...it import timeit
f = lambda x: x + 2
g = lambda x: x ** 2
def fg(x):
yield f(x)
yield g(x)
print timeit(stmt='list(chain.from_iterable((f(x), g(x)) for x in range(3)))',
setup='gc.enable(); from itertools import chain; f = lambda x: x + 2; g = lambda x: x ** 2')
print timeit...
How do I update the GUI from another thread?
Which is the simplest way to update a Label from another Thread ?
47 Answers
47
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Subclassing a Java Builder class
...
You can solve it using generics. I think this is called the "Curiously recurring generic patterns"
Make the return type of the base class builder methods a generic argument.
public class NutritionFacts {
private final ...
How to make vim paste from (and copy to) system's clipboard?
...ke other editors, vim stores copied text in its own clipboard. So, it's very hard for me to copy some text from a webpage and paste it into the current working file. It so happens I have to either open gedit or type it manually.
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List Git aliases
How do I print a list of my git aliases, i.e., something analogous to the bash alias command?
16 Answers
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Is having an 'OR' in an INNER JOIN condition a bad idea?
In trying to improve the speed of an immensely slow query (several minutes on two tables with only ~50,000 rows each, on SQL Server 2008 if it matters), I narrowed down the problem to an OR in my inner join, as in:
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