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What is the purpose of willSet and didSet in Swift?
... = 0 {
didSet {
print("The value of myProperty changed from \(oldValue) to \(myProperty)")
}
}
}
myProperty prints its old and new value every time it is modified. With just getters and setters, I would need this instead:
class Foo {
var myPropertyValue: Int = ...
Remove/hide a preference from the screen
...have an activity which extends PreferenceActivity.
I'm loading preferences from the xml file.
But in some cases i need completely hide one of the preferences from the screen based on my app state. There is a setEnabled method, but it's not exactly what i want. I want to remove that preference from t...
What is the difference between HTTP_HOST and SERVER_NAME in PHP?
...
The HTTP_HOST is obtained from the HTTP request header and this is what the client actually used as "target host" of the request. The SERVER_NAME is defined in server config. Which one to use depends on what you need it for. You should now however rea...
Fundamental difference between Hashing and Encryption algorithms
...d a (usually) fixed length (or smaller length) output. It can be anything from a simple crc32, to a full blown cryptographic hash function such as MD5 or SHA1/2/256/512. The point is that there's a one-way mapping going on. It's always a many:1 mapping (meaning there will always be collisions) si...
How can I get the console logs from the iOS Simulator?
...
Is this still accurate? I'm not seeing anything from console.log in these log using tail or Console.app
– Jeff
Mar 11 '14 at 20:07
3
...
What is a raw type and why shouldn't we use it?
... raw type.
A non-static member type of a raw type R that is not inherited from a superclass or superinterface of R.
Here's an example to illustrate:
public class MyType<E> {
class Inner { }
static class Nested { }
public static void main(String[] args) {
MyType mt;...
Generate JSON string from NSDictionary in iOS
...5.0 and Mac OS X 10.7. See NSJSONSerialization.
To generate a JSON string from a NSDictionary or NSArray, you do not need to import any third party framework anymore.
Here is how to do it:
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionaryOrArrayToOutput
...
Check if an array contains any element of another array in JavaScript
... @Batman: The result is true/false, but you can adapt the solution from Mr. skyisred
– 0zkr PM
Jun 19 '19 at 22:58
|
show 2 more com...
Clear back stack using fragments
...
I posted something similar here
From Joachim's answer, from Dianne Hackborn:
http://groups.google.com/group/android-developers/browse_thread/thread/d2a5c203dad6ec42
I ended up just using:
FragmentManager fm = getActivity().getSupportFragmentManager();
fo...
How to flush output of print function?
...ter command line (first line of the script file), so change the first line from (something like) #!/usr/bin/python3 to #!/usr/bin/python3 -u - now when you run your script (e.g. ./my_script.py) the -u will always be added for you
– James
Sep 7 at 17:22
...