Here is an example:
my_array = array('i', [1,2,3,4,5])
c=[11,12,13]
my_array.fromlist(c)
# array('i', [1, 2, 3, 4, 5, 11, 12, 13])
So we see that the values 11,12 and 13 were added from list c to my_array.
This method provides you the array buffer start address in memory and number of elements in array. Here is an example:
my_array = array('i', [1,2,3,4,5])
my_array.buffer_info()
(33881712, 5)
Sometimes, if an action should be bind to a collection view's cell selection, you have to implement the UICollectionViewDelegate protocol.
Let's say the collection view is inside a UIViewController MyViewController.
Objective-C
In your MyViewController.h declares that it implements the UICollecti...
Provided that barButtonItem has a non-null image property (e.g. set in the Interface Builder).
Objective-C
barButtonItem.image = [barButtonItem.image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
-(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 ...
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...
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(...
Name-based virtual hosting on Apache is described on the Apache website as such:
With name-based virtual hosting, the server relies on the client to
report the hostname as part of the HTTP headers. Using this technique,
many different hosts can share the same IP address.
Therefore, more than...
This command will save the open file with sudo rights
:w !sudo tee % >/dev/null
You can also map w!! to write out a file as root
:cnoremap w!! w !sudo tee % >/dev/null
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...
A Semantic Model offers a deeper level of interpretation and insight of code compare to a syntax tree. Where syntax trees can tell the names of variables, semantic models also give the type and all references. Syntax trees notice method calls, but semantic models give references to the precise locat...
Create a file named '.jshintrc' in the root of your app, where package.json is.
*Note on windows: create a file named "jshintrc.txt". Then rename it to ".jshintrc." (notice the dot at the end).
This is a configuration file. It can for example tell jshint to ignore certain varia...
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&...
You can use npm install -g to install a package "globally." This is typically done to install an executable that you can add to your path to run. For example:
npm install -g gulp-cli
If you update your path, you can call gulp directly.
On many OSes, npm install -g will attempt to writ...
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...
OpenCL is short for Open Computing Language. OpenCL is a Framework for parallel programming across heterogeneous platforms, called compute devices, ranging from CPUs over GPUs to more special platforms like FPGAs. OpenCL provides a standard interface for parallel computing on these compute devices b...
Every Windows Phone project contains App.cs class:
public sealed partial class App : Application
This class is your global application context.
General Application class usage:
App entry point, particularly for various activation contracts.
Application lifecycle management.
Application g...
Perl supports many kinds of conditional statements (statements that are based on boolean results). The most common conditional statements are if-else, unless, and ternary statements. given statements are introduced as a switch-like construct from C-derived languages and are available in versions Per...
