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To create a search form, enter the following code <%= form_tag("/search", method: "get") do %> <%= label_tag(:q, "Search for:") %> <%= text_field_tag(:q) %> <%= submit_tag("Search") %> <% end %> form_tag: This is t...

Assuming an implicit parameter list with more than one implicit parameter: case class Example(p1:String, p2:String)(implicit ctx1:SomeCtx1, ctx2:SomeCtx2) Now, assuming that one of the implicit instances is not available (SomeCtx1) while all other implicit instances needed are in-scope, to creat...

This is an example of a package-info.java file that binds an XML namespace to a serializable Java class. This should be placed in the same package as the Java classes that should be serialized using the namespace. /** * A package containing serializable classes. */ @XmlSchema ( xmlns = ...

SQL Server 2016 Splits a string expression using a character separator. Note that STRING_SPLIT() is a table-valued function and therefore must be used within FROM clause. Parameters: string. Any character type expression (char, nchar, varchar or nvarchar) seperator. A single character expressi...

Browser support for ES6 is growing, but to be sure your code will work on environments that dont fully support it, you can use Babel, the ES6/7 to ES5 transpiler, try it out! If you would like to use ES6/7 in your projects without having to worry about compatibility, you can use Node and Babel CLI ...

This is a step-by-step guide to installing OpenCV 3 on a Debian-based Linux system from source. The steps should stay the same for other distros, just replace the relevant package manager commands when installing packages for the build. Note: If you don't feel like wasting time building stuff or di...

npm --install express-generator -g

express my-app

The result of casting a pointer to an integer using reinterpret_cast is implementation-defined, but "... is intended to be unsurprising to those who know the addressing structure of the underlying machine." int x = 42; int* p = &x; long addr = reinterpret_cast<long>(p); std::...

PROGRAM zhello_world. CLASS main DEFINITION FINAL CREATE PRIVATE. PUBLIC SECTION. CLASS-METHODS: start. ENDCLASS. CLASS main IMPLEMENTATION. METHOD start. cl_demo_output=>display( 'Hello World!' ). ENDMETHOD. ENDCLASS. START-OF-SELECTION. main=>start( ).

this topic is a classical issue in iOS development, and its solution is various as other example already shown. In this example I'll show another daily common use one: passing data using closure by adapting delegate pattern example on this page into callback closure! one thing this method is superi...

To enable - type: :set number or :set nu. To disable - type: :set nonumber or :set nonu. To enable enumerating relative to the cursor location - type: :set relativenumber. To disable enumerating relative to the cursor location - type: :set norelativenumber. Note: To change whether the curren...

Using dotnet new will scaffold a new console application. To scaffold other types of projects, use the -t or --type flag: dotnet new -t web dotnet restore dotnet run The available templates vary by language. C# Templates console (default) - A console application. web - An ASP.NET Core app...

By default, dotnet new creates C# projects. You can use the -l or --lang flag to scaffold projects in other languages: dotnet new -l f# dotnet restore dotnet run Currently, dotnet new supports C# and F#.

To create a NuGet package from a project, run this command from a directory that contains project.json: dotnet pack The resulting .nupkg file will be named and versioned according to the properties in project.json. If there are multiple frameworks targeted in the project file, the package will s...

Running dotnet test from inside a folder that contains a test project will launch the test runner. The test runner will discover and run the tests in the project. To be compatible with dotnet test, the project.json file must contain a testRunner property and a dependency on a compatible test runner...

Command line scripts inside python packages are common. You can organise your package in such a way that when a user installs the package, the script will be available on their path. If you had the greetings package which had the command line script hello_world.py. greetings/ greetings/ ...

Note: Following instructions are written for Python 2.7 (unless specified): instructions for Python 3.x are similar. WINDOWS First, download the latest version of Python 2.7 from the official Website (https://www.python.org/downloads/). Version is provided as an MSI package. To install it manu...

Facade is structural design pattern. It hides the complexities of large system and provides a simple interface to client. Client uses only Facade and it's not worried about inter dependencies of sub-systems. Definition from Gang of Four book: Provide a unified interface to a set of interfaces i...

As of Java 8, there are default methods on the Map.Entry interface to allow sorting of map iterations. Java SE 8 Map<String, Integer> numberOfEmployees = new HashMap<>(); numberOfEmployees.put("executives", 10); numberOfEmployees.put("human ressources", 32); numb...