Tutorial by Examples: ed

Always use Named Arguments to optional parameters, to avoid potential bugs when the method is modified. class Employee { public string Name { get; private set; } public string Title { get; set; } public Employee(string name = "<No Name>", string title = "&lt...

In many examples, you will find a service id like 'acme.demo.service.id' (a string with dots). You services.yml will look like this: services: acme.demo.service.id: class: Acme\DemoBundle\Services\DemoService arguments: ["@doctrine.orm.default_entity_manager", &quot...

Create a new database. $ wp db create Drop an existing database. $ wp db drop --yes Reset the current database. $ wp db reset --yes Execute a SQL query stored in a file. $ wp db query < debug.sql

Go to Hardware -> Device:

Django's signals are restricted to precise class signatures upon registration, and thus subclassed models are not immediately registered onto the same signal. Take this model and signal for example class Event(models.Model): user = models.ForeignKey(User) class StatusChange(Event): ...

Let's say we want to eliminate duplicated subsequence element from a string (it can be more than one). For example: 2,14,14,14,19 and convert it into: 2,14,19 Using gsub, we can achieve it: gsub("(\\d+)(,\\1)+","\\1", "2,14,14,14,19") [1] "2,14,19" ...

Sometimes you would want to start or remove an action on a specific node at a certain time. For example, you might want to stop a moving object when the user taps the screen. This becomes very helpful when a node has multiple actions and you only wants to access one of them. let move = SKAction.mov...

Sample Data: CREATE TABLE table_name ( id, list ) AS SELECT 1, 'a,b,c,d' FROM DUAL UNION ALL -- Multiple items in the list SELECT 2, 'e' FROM DUAL UNION ALL -- Single item in the list SELECT 3, NULL FROM DUAL UNION ALL -- NULL list SELECT 4, 'f,,g' FROM DUAL; -- NULL item...

Code get_the_title( 44 ); Output The title of the post id:44.

Create enum of custom errors enum RegistrationError: Error { case invalidEmail case invalidPassword case invalidPhoneNumber } Create extension of RegistrationError to handle the Localized description. extension RegistrationError: LocalizedError { public var errorDescription...

The following example demonstrates using Lumen in WAMP / MAMP / LAMP environments. To work with Lumen you need to setup couple of things first. Composer PHPUnit git (not required but strongly recommended) Assuming you have all these three components installed (at least you need composer), f...

//This example gets the response from iTunes { "rest": { "name": "rest", "connector": "rest", "debug": true, "options": { "useQuerystring": true, "timeout": 10000, "headers": { "accepts": "application/json", "content-type": "applicati...

There are many responsive scenarios where it's necessary to have column units exceeding 12 in a single .row element. This is known as column wrapping. If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line. For example, cons...

There are a number of issues with Oracle. Here's how to resolve them. Assuming your procedure output parameter is ref cursor, you will get this exception. java.sql.SQLException: Invalid column type: 2012 So change Types.REF_CURSOR to OracleTypes.CURSOR in simpleJdbcCall.declareParameters() ...

BFS can be used to find the connected components of an undirected graph. We can also find if the given graph is connected or not. Our subsequent discussion assumes we are dealing with undirected graphs.The definition of a connected graph is: A graph is connected if there is a path between every p...

In this example, we use this database: "your-project-name" : { "users" : { "randomUserId1" : { "display-name" : "John Doe", "gender" : "male" } "randomUserId2" :...

Note: You need to know which data referenced by getReference() first before you can completely understand this example. There are three common method to get your data from Firebase Realtime Database: addValueEventListener() addListenerForSingleValueEvent() addChildEventListener() When w...

Most examples show instantiating and holding a LazySingleton object until the owning application has terminated, even if that object is no longer needed by the application. A solution to this is to implement IDisposable and set the object instance to null as follows: public class LazySingleton : ID...

Mage::helper('catalog/image')->init($item->getProduct(), 'thumbnail'); Mage::helper('catalog/image')->init($item->getProduct(), 'small_image'); Mage::helper('catalog/image')->init($item->getProduct(), 'image');

Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getThumbnail()); //Thumbnail Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getSmallImage()); //Small Image Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getImage(...