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What does .SD stand for in data.table in R
.SD looks useful but I do not really know what I am doing with it. What does it stand for? Why is there a preceding period (full stop). What is happening when I use it?
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Eclipse: All my projects disappeared from Project Explorer
...hort of restoring my entire workspace from a backup.
Edit: This answer is now quite old, and better solutions may now exist. Although I haven't had need to try it, I recommend attempting @antonagestam's solution first, as others have suggested it may be faster and more effective.
Edit: Since it's ...
Retrieving Property name from lambda expression
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now in C# 6 you can simply use nameof like this nameof(User.UserId)
which has many benefits, among them is that this is done at compile time, not runtime.
https://msdn.microsoft.com/en-us/magazine/dn802602.aspx
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When should one use RxJava Observable and when simple Callback on Android?
...});
The RxJava variant is not much better than the Callback variant. For now, let's ignore the error handling.
Let's take a list of photos:
RxJava:
api.getUserPhotos(userId)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.flatMap(new Func1<List<Photo>, Observab...
How to get the separate digits of an int number?
...ng, then chars() method to get an IntStream (each char from your string is now an Ascii number), then you need to run map() method to get a numeric values of the Ascii number. At the end you use toArray() method to change your stream into an int[] array.
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Pure JavaScript Send POST Data Without a Form
...ery $.post() )? Maybe httprequest or something else (just can't find it now)?
8 Answers
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Reflection: How to Invoke Method with parameters
...called");
Console.WriteLine("Hello" + name + " at " + DateTime.Now);
}
public void Run(string parameters)
{
Console.WriteLine("Run() called");
Console.Write("You typed:" + parameters);
}
public string TestNoParameters()
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Difference between app.all('*') and app.use('/')
...sition of the router in middleware will be more important than it is right now, since you technically don't even have to use it right now).
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Detecting touch screen devices with Javascript
...t on devices with no touch input running a touch-capable browser. I don't know of a way to detect device touch capability natively, without just waiting for a touch event to occur.
– Stu Cox
Dec 12 '12 at 11:24
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How to print a percentage value in python?
...>>> 1 / 3
0.3333333333333333
# The above 33% example would could now be written without the explicit
# float conversion:
>>> print "{0:.0f}%".format(1/3 * 100)
33%
# Or even shorter using the format mini language:
>>> print "{:.0%}".format(1/3)
33%
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