count() will return the number of times and element appears in an array. In the following example we see that the value 3 occurs twice.
my_array = array('i', [1,2,3,3,5])
my_array.count(3)
# 2
When you need a Python list object, you can utilize the tolist() method to convert your array to a list.
my_array = array('i', [1,2,3,4,5])
c = my_array.tolist()
# [1, 2, 3, 4, 5]
An alert box can be popped-up on a Xamarin.Forms Page by the method, DisplayAlert. We can provide a Title, Body (Text to be alerted) and one/two Action Buttons. Page offers two overrides of DisplayAlert method.
public Task DisplayAlert (String title, String message, String cancel)
This overri...
Suppose that we have a sequence of integers and we want to create a sequence that contains only the even integers. We can obtain the latter by using the filter function of the Seq module. The filter function has the type signature ('a -> bool) -> seq<'a> -> seq<'a>; this indicat...
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
Context is important if you ship your class for others to use.Context lets your class observer verify that its you observer which is being called.
The ...
If you are using library that contains (for example) AwesomeViewController with a wrong status bar color you can try this:
let awesomeViewController = AwesomeViewController()
awesomeViewController.navigationBar.barStyle = .blackTranslucent // or other style
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An interface is declared like a class, but without access modifiers (public, private, ...). Also, no definitions are allowed, so variables and constants can't be used.
Interfaces should always have an Unique Identifier, which can be generated by pressing Ctrl + Shift + G.
IRepository = interface
...
Classes can implement more than one interface, as opposed to inheriting from more than one class (Multiple Inheritance) which isn't possible for Delphi classes. To achieve this, the name of all interfaces must be added comma-separated behind the base class.
Of course, the implementing class must al...
Interfaces can inherit from each other, exactly like classes do, too. An implementing class thus has to implement functions of the interface and all base interfaces. This way, however, the compiler doesn't know that the implenting class also implements the base interface, it only knows of the interf...
Since the declaration of variables in interfaces isn't possible, the "fast" way of defining properites (property Value: TObject read FValue write FValue;) can't be used. Instead, the Getter and setter (each only if needed) have to be declared in the interface, too.
IInterface = interface(...
Add this to your $MYVIMRC:
" Source vim configuration file whenever it is saved
if has ('autocmd') " Remain compatible with earlier versions
augroup Reload_Vimrc " Group name. Always use a unique name!
autocmd! " Clear any preexisting autoc...
RxSwift offers many ways to create an Observable, let's take a look:
import RxSwift
let intObservale = Observable.just(123) // Observable<Int>
let stringObservale = Observable.just("RxSwift") // Observable<String>
let doubleObservale = Observable.just(3.14) // Observable&...
Node Version Manager (nvm) greatly simplifies the management of Node.js versions, their installation, and removes the need for sudo when dealing with packages (e.g. npm install ...). Fish Shell (fish) "is a smart and user-friendly command line
shell for OS X, Linux, and the rest of the family&...
Square Root
Use Math.sqrt() to find the square root of a number
Math.sqrt(16) #=> 4
Cube Root
To find the cube root of a number, use the Math.cbrt() function
6
Math.cbrt(27) #=> 3
Finding nth-roots
To find the nth-root, use the Math.pow() function and pass in a fractional expo...
This is a custom JAX-RS @Provider to use Gson as the JSON parser. The example also shows how to use custom Java 8 date/time converters.
@Provider
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class JerseyServerGson
implements MessageBodyWriter<O...
2005
The following iterates over the characters of the string s. It works similarly for looping over the elements of an array or a set, so long as the type of the loop-control variable (c, in this example) matches the element type of the value being iterated.
program ForLoopOnString;
{$APPTYPE ...
If you have a modern CPU or graphics card (GPU) inside your machine, chances are you have everything ready for first steps in OpenCL.
Finding out if your processor is OpenCL capable can be usually done via the manufacturer's homepage, a good first start is the official documentation at
https://www...
