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What is polymorphism, what is it for, and how is it used?
... import file) and then determining what type it is (Excel, CSV, YAML, SQL, etc. etc.). To do this one would need some sort of factory class for Class_Excel, Class_CSV to be called, or have a Reader class called. Either way, some sort of iterative if/then/else is going to have to be stored somewher...
Separate REST JSON API server and client? [closed]
...fferent clients: front-end websites, smartphone apps, backend webservices, etc. So I really want a JSON REST API for each one.
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Objective-C: Where to remove observer for NSNotification?
...wont cause you to do logic while the controller is being pushed off screen etc. There are special cases where the controller should receive notifications when it is off-screen I guess you can't do this. But events like that should probably be in your model.
– RickiG
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data.table vs dplyr: can one do something well the other can't or does poorly?
...ll become a column in result. You can use c(), as.list(), lapply(), list() etc... base functions to accomplish this, without having to learn any new functions.
You will need to learn just the special variables - .N and .SD at least. The equivalent in dplyr are n() and .
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dplyr provides s...
What is attr_accessor in Ruby?
... talks about syntax like some_method :name => "whatever", :notherName, :etc
– B T
Feb 5 '15 at 1:19
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How do I access the host machine from the guest machine? [closed]
...utername.local - this applies for connection to file sharing, web sharing, etc
– Johnus
Dec 24 '10 at 0:57
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How to stop and restart memcached server?
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Using root, try something like this:
/etc/init.d/memcached restart
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Full Screen DialogFragment in Android
...(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = (Button) findViewById(R.id.show);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog();
}
});
}
@...
What are all the uses of an underscore in Scala?
...s taken on scala-lang.org and noticed a curious question: " Can you name all the uses of “_”? ". Can you? If yes, please do so here. Explanatory examples are appreciated.
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Haskell Type vs Data Constructor
...ide what arguments they are going to put in.
A case study
As the home stretch here, we can consider the Maybe a type. Its definition is
data Maybe a = Nothing
| Just a
Here, Maybe is a type constructor that returns a concrete type. Just is a data constructor that returns a value. N...