Tutorial by Examples: r

Helpers for form elements

Checkboxes <%= check_box_tag(:pet_dog) %> <%= label_tag(:pet_dog, "I own a dog") %> <%= check_box_tag(:pet_cat) %> <%= label_tag(:pet_cat, "I own a cat") %> This will generate the following html <input id="pet_dog" name="pet_dog&q...

Resolving Implicit Parameters Using 'implicitly'

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...

Binding an XML namespace to a serializable Java class.

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 = ...

String_Split

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...

Start using ES6/7 with Babel

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 ...

Build and install OpenCV from source

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...

D3js with Angular

Using D3js with Angular can open up new fronts of possibilities such as live updation of charts as soon as data is updated. We can encapsulate complete chart functionality within an Angular directive, which makes it easily reusable. index.html >> <!DOCTYPE html> <html ng-app="...

RijndaelManaged

Required Namespace: System.Security.Cryptography private class Encryption { private const string SecretKey = "topSecretKeyusedforEncryptions"; private const string SecretIv = "secretVectorHere"; public string Encrypt(string data...

Installing Express Generator

npm --install express-generator -g

Creating an App

express my-app

Start App

Using start option npm start Using Nodemon nodemon Using forever forever start 'js file name' To stop in forever forever stop ''js file name' To restart in forever forever restart 'js filename' List the server ruuning using forever forever list

Numeric value of a pointer

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::...

Hello World in ABAP Objects

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( ).

Using callback closure(block) passing data back

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...

ORC

The Optimized Row Columnar (ORC) file format provides a highly efficient way to store Hive data. It was designed to overcome limitations of the other Hive file formats. Using ORC files improves performance when Hive is reading, writing, and processing data. ORC file can contain lightweight indexes a...

PARQUET

Parquet columnar storage format in Hive 0.13.0 and later. Parquet is built from the ground up with complex nested data structures in mind, and uses the record shredding and assembly algorithm described in the Dremel paper. We believe this approach is superior to simple flattening of nested name spac...

AVRO

Avro files are been supported in Hive 0.14.0 and later. Avro is a remote procedure call and data serialization framework developed within Apache's Hadoop project. It uses JSON for defining data types and protocols, and serializes data in a compact binary format. Its primary use is in Apache Hadoop,...

Toggle line enumerating

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...

Scaffolding other project types

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...

Scaffolding projects in other languages

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#.

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