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Windows Verify that you have the correct JDK. You can check it by opening command prompt (press windows key and write cmd). In the command prompt type javac -version, this will show the current version of JDK installed on your matching or an error* if Java is missing. If the JDK is not availabl...

ALTER TABLE Employees DROP COLUMN salary; This will not only delete information from that column, but will drop the column salary from table employees(the column will no more exist).

This example is a quick setup of Angular 2 and how to generate a quick example project. Prerequisites: Node.js v4 or greater. npm v3 or greater or yarn. Open a terminal and run the commands one by one: npm install -g @angular/cli or yarn global add @angular/cli depending on your choi...

The main difference is that double-quoted String literals support string interpolations and the full set of escape sequences. For instance, they can include arbitrary Ruby expressions via interpolation: # Single-quoted strings don't support interpolation puts 'Now is #{Time.now}' # Now is #{Time...

By default, all the required libraries for build ASP.NET applications are included during the installation of Visual Studio. If a newer version of ASP.NET is released that was not included with Visual Studio, you can download the appropriate SDK library from Microsoft, which will include all the nec...

Few people have issue regarding error message not displaying if existing value is being entered in textbox. So, For Example I'm not allowing user to enter existing email. signup.php (Page where you wanted to sign up new user without existing email id) Remove use yii\bootstrap\ActiveForm; (if p...

Tuples are created using generic types Tuple<T1>-Tuple<T1,T2,T3,T4,T5,T6,T7,T8>. Each of the types represents a tuple containing 1 to 8 elements. Elements can be of different types. // tuple with 4 elements var tuple = new Tuple<string, int, bool, MyClass>("foo", 123, t...

To access tuple elements use Item1-Item8 properties. Only the properties with index number less or equal to tuple size are going to be available (i.e. one cannot access Item3 property in Tuple<T1,T2>). var tuple = new Tuple<string, int, bool, MyClass>("foo", 123, true, new MyC...

Some people have issues regarding error messages not being displayed if an existing value is being entered. For example I'm not allowing a user signup with an existing email. View <?php ...................... <?= $form->field($modelUser, 'email')->textInput(['class'=&gt...

In Python 2, range function returns a list while xrange creates a special xrange object, which is an immutable sequence, which unlike other built-in sequence types, doesn't support slicing and has neither index nor count methods: Python 2.x2.3 print(range(1, 10)) # Out: [1, 2, 3, 4, 5, 6, 7, 8, 9...

With any variadic function, the function must know how to interpret the variable arguments list. With the printf() or scanf() functions, the format string tells the function what to expect. The simplest technique is to pass an explicit count of the other arguments (which are normally all the same ...

Python 3.x3.0 In Python 3, you can unpack an iterable without knowing the exact number of items in it, and even have a variable hold the end of the iterable. For that, you provide a variable that may collect a list of values. This is done by placing an asterisk before the name. For example, unpacki...

LINQ requires .NET 3.5 or higher (or .NET 2.0 using LINQBridge). Add a reference to System.Core, if it hasn't been added yet. At the top of the file, import the namespace: C# using System; using System.Linq; VB.NET Imports System.Linq

The Dart SDK includes everything you need to write and run Dart code: VM, libraries, analyzer, package manager, doc generator, formatter, debugger, and more. If you are doing web development, you will also need Dartium. Automated installation and updates Installing Dart on Windows Installing Da...

Module serves as a container of different parts of your app such as controllers, services, filters, directives, etc. Modules can be referenced by other modules through Angular's dependency injection mechanism. Creating a module: angular .module('app', []); Array [] passed in above example ...

As long as the element is a block, and it has an explicitly set width value, margins can be used to center block elements on a page horizontally. We add a width value that is lower than the width of the window and the auto property of margin then distributes the remaining space to the left and the ...

Overview Unity runs on Windows and Mac. There is also a Linux alpha version available. There are 4 different payment plans for Unity: Personal - Free (see below) Plus - $35 USD per month per seat (see below) Pro - $125 USD per month per seat - After subscribing to the Pro plan for 24 consecut...

In your Visual Studio open the Solution Explorer window then right click on your project then choose Manage NuGet Packages from the menu: In the window that opens type EntityFramework in the search box in the top right. Or if you are using Visual Studio 2015 you'll see something like this: ...

It is possible to treat a GoogleMap as an Android view if we make use of the provided MapView class. Its usage is very similar to MapFragment. In your layout use MapView as follows: <com.google.android.gms.maps.MapView xmlns:android="http://schemas.android.com/apk/res/android" ...

Prefer public class Order { public OrderLine AddOrderLine(OrderLine orderLine) { if (orderLine == null) throw new ArgumentNullException(nameof(orderLine)); ... } } Over public class Order { public OrderLine AddOrderLine(OrderLine orderLine) { ...