Tutorial by Examples: an

Alerts and errors are nearly the simplest of all Meteor component patterns. They're so simple, in fact, that they barely register as a pattern in of themselves. Instead of adding FlashAlert modules or patterns, all you really need to do is style a Handlebar template appropriate, add a helper, and wi...

Generally, if we want to remove an element from an array, we need to know it's index so that we can remove it easily using remove(at:) function. But what if we don't know the index but we know the value of element to be removed! So here is the simple extension to an array which will allow us to re...

RecyclerView will perform a relevant animation if any of the "notify" methods are used except for notifyDataSetChanged; this includes notifyItemChanged, notifyItemInserted, notifyItemMoved, notifyItemRemoved, etc. The adapter should extend this class instead of RecyclerView.Adapter. impo...

The wrap panel acts in a similar way to stack panel. Except when it recognizes the items will exceed it's size, it would then wrap them to a new row/column, depending on it's orientation. Horizontal orientation <WrapPanel Width="100"> <Button Content="Button"/&g...

If you plan to host your Django website on Heroku, you can start your project using the Heroku Django Starter Template : django-admin.py startproject --template=https://github.com/heroku/heroku-django-template/archive/master.zip --name=Procfile YourProjectName It has Production-ready configurati...

Android 6 (API23) introduced Doze mode which interferes with AlarmManager. It uses certain maintenance windows to handle alarms, so even if you used setExactAndAllowWhileIdle() you cannot make sure that your alarm fires at the desired point of time. You can turn this behavior off for your app using...

var alphabet:Array = [ "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S...

Another way to implement item click listener is to use interface with several methods, the number of which is equal to the number of clickable views, and use overrided click listeners as you can see below. This method is more flexible, because you can set click listeners to different views and quite...

HVFL is a language designed to constrain UI elements in a simple and quick fashion. Generally, VFL has an advantage over traditional UI customization in the Interface Builder because it's much more readable, accessible and compact. Here's an example of VFL, in which three UIViews are constrained f...

After defining an enum using any of the above ways and setting a variable, you can print both the variable's value as well as the corresponding name from the enum for the value. Here's an example: // Define the enum var ColorsEnum = { WHITE: 0, GRAY: 1, BLACK: 2 } Object.freeze(ColorsEnum); // D...

A lot of the value from local JVM unit tests comes from the way you design your application. You have to design it in such a way where you can decouple your business logic from your Android Components. Here is an example of such a way using the Model-View-Presenter pattern. Lets practice this out by...

Redirect to within application (another action of specific controller). return $this->redirect([ 'controller' => 'myController', 'action' => 'myAction' ]); Redirect to referrer page return $this->redirect($this->referer()); Redirect to outside of application or spec...

Set default layout for entire application. i.e, created layout file in /src/Template/Layout/admin.ctp class AppsController extends Controller { public function beforeFilter(Event $event) { parent::beforeFilter($event); $this->viewBuilder()->layout('admin'); // For Ver...

Given this function: annualSalaryCalc :: (RealFloat a) => a -> a -> String annualSalaryCalc hourlyRate weekHoursOfWork | hourlyRate * (weekHoursOfWork * 52) <= 40000 = "Poor child, try to get another job" | hourlyRate * (weekHoursOfWork * 52) <= 120000 = "Money...

To enable or disable a BroadcastReceiver, we need to get a reference to the PackageManager and we need a ComponentName object containing the class of the receiver we want to enable/disable: ComponentName componentName = new ComponentName(context, MyBroadcastReceiver.class); PackageManager packageM...

If you want your application to support a plug-in system, for example to load plug-ins from assemblies located in plugins folder: interface IPlugin { string PluginDescription { get; } void DoWork(); } This class would be located in a separate dll class HelloPlugin : IPlugin { ...

CoffeeScript is a scripting language that compiles into JavaScript. Any code written in CoffeeScript can be translated into JavaScript with a one-to-one matching. CoffeeScript can be easily installed with npm: $ mkdir coffee && cd coffee $ npm install -g coffee-script The -g flag will ...

NSMutableArray can be initialized as an empty array like this: NSMutableArray *array = [[NSMutableArray alloc] init]; // or NSMutableArray *array2 = @[].mutableCopy; // or NSMutableArray *array3 = [NSMutableArray array]; NSMutableArray can be initialized with another array like this: NSMuta...

Extension Method can work on null references, but you can use ?. to null-check anyway. public class Person { public string Name {get; set;} } public static class PersonExtensions { public static int GetNameLength(this Person person) { return person == null ? -1 : pers...

To list all available schemes for the project in your current directory xcodebuild -list Optionally you can pass a path to a project or workspace file xcodebuild -list -workspace ./MyApp.xcworkspace xcodebuild -list -project ./MyApp.xcodeproj Example output Information about project "...