Tutorial by Examples: od

runOutsideAngular can be used to run code outside Angular 2 so that it does not trigger change detection unnecessarily. This can be used to for example run multiple HTTP request to get all the data before rendering it. To execute code again inside Angular 2, run method of NgZone can be used. my.com...

public void ConfigureServices(IServiceCollection services) { services.AddCors(o => o.AddPolicy("MyPolicy", builder => { builder.AllowAnyOrigin() .AllowAnyMethod() .AllowAnyHeader(); })); // ... } public void Configur...

public void ConfigureServices(IServiceCollection services) { services.AddMvc(); services.AddCors(); services.ConfigureCors(options => options.AddPolicy("AllowSpecific", p => p.WithOrigins("http://localhost:1233") ...

Categorical products In category theory, the product of two objects X, Y is another object Z with two projections: π₁ : Z → X and π₂ : Z → Y; such that any other two morphisms from another object decompose uniquely through those projections. In other words, if there exist f₁ : W → X and f₂ : W →...

Sometimes the default Scrapy user agent ("Scrapy/VERSION (+http://scrapy.org)") is blocked by the host. To change the default user agent open settings.py, uncomment and edit the following line to what ever you want. #USER_AGENT = 'projectName (+http://www.yourdomain.com)' For example ...

To detect the environment on the server, we have to create a helper method on the server, as the server will determine which environment it is in, and then call the helper method from the client. Basically, we just relay the environment info from the server to the client. //------------------------...

As of Meteor 1.3, Meteor now exposes the NODE_ENV variable on the client by default. if (Meteor.isClient) { Meteor.startup(function () { if(process.env.NODE_ENV === "testing"){ console.log("In testing..."); } if(process.env.NODE_ENV === "production&...

This follwing is a pure-Blaze approach to toggling UI elements into and outof existence. Think of this as a replacement for modal dialogs. In fact, there are a number of ways to implement modal dialogs using this method (simply add background masks and animations). Document Object Model <templa...

NOTE: This example is WIP, it will be updated with diagrams, images, more examples, etc. What is Phong? Phong is a very basic, but real looking light model for surfaces that has three parts: ambient, diffuse, and specular lighting. Ambient Lighting: Ambient lighting is the simplest of the t...

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...

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...

initialize() is introduced in CakePHP version > 3.0 As a code structure, it looks like same as beforeFilter() method. but there is many differences between beforeFilter() and initialize(). initialize() is always called after constructor is called. but beforeFilter() is not calling in case of ...

If you’re switching to Jekyll from another blogging system, Jekyll’s importers can help you with the move. Most methods listed on this page require read access to the database from your old system to generate posts for Jekyll. Each method generates .markdown posts in the _posts directory based on th...

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...

from __future__ import print_function import multiprocessing def countdown(count): while count > 0: print("Count value", count) count -= 1 return if __name__ == "__main__": p1 = multiprocessing.Process(target=countdown, args=(10,)) ...

When an object is exposed to the template context, its arguments-less methods are available. This is useful when these functions are "getters". But it can be hazardeous if these methods alter some data or have some side effects. Eventhough you likely trust the template writer, he may not b...

This attribute is used to describe the product that this particular assembly is for. Multiple assemblies can be components of the same product, in which case they can all share the same value for this attribute. [assembly: AssemblyProduct("MyProduct")]

Inherits Specifies the base (or parent) class Public Class Person End Class Public Class Customer Inherits Person End Class 'One line notation Public Class Student : Inherits Person End Class Possible objects: Dim p As New Person Dim c As New Customer Dim s As New Student ...

Overridable Allows a property or method in a class to be overridden in a derived class. Public Class Person Public Overridable Sub DoSomething() Console.WriteLine("Person") End Sub End Class Overrides Overrides an Overridable property or method defined in the base...

Ruby has three types of objects: Classes and modules which are instances of class Class or class Module. Instances of classes. Singleton Classes. Each object has a class which contains its methods: class Example end object = Example.new object.class # => Example Example.class # ...