Tutorial by Examples: e

def hello puts "Hello readers" end hello # => "Hello readers" def hello puts "Hell riders" end hello # => "Hell riders"

puts "Hello readers".reverse # => "sredaer olleH" class String def reverse "Hell riders" end end puts "Hello readers".reverse # => "Hell riders"

You can access the exact same context as the method you override. class Boat def initialize(name) @name = name end def name @name end end puts Boat.new("Doat").name # => "Doat" class Boat def name "⛵ #{@name} ⛵" end end ...

class String def fancy "~~~{#{self}}~~~" end end puts "Dorian".fancy # => "~~~{Dorian}~~~"

public class UserModel { [Required] [StringLength(6, MinimumLength = 3)] [RegularExpression(@"(\S)+", ErrorMessage = "White space is not allowed")] public string UserName { get; set; } [Required] [StringLeng...

<appSettings> <add key="ClientValidationEnabled" value="true"/> <add key="UnobtrusiveJavaScriptEnabled" value="true"/> </appSettings>

<package id="jQuery" version="1.10.2" targetFramework="net452" /> <package id="jQuery.Validation" version="1.11.1" targetFramework="net452" /> <package id="Microsoft.jQuery.Unobtrusive.Validation" version="3....

@model WebApplication4.Models.UserModel @{ ViewBag.Title = "Register"; } <h2>@ViewBag.Title.</h2> @using (Html.BeginForm("Register", "Account", FormMethod.Post, new { @class = "form-horizontal", role = "form" })) { @Htm...

public class BundleConfig { public static void RegisterBundles(BundleCollection bundles) { bundles.Add(new ScriptBundle("~/bundles/jquery").Include( "~/Scripts/jquery-{version}.js")); bundles.A...

These events can be used to communicate between 2 or more controllers. $emit dispatches an event upwards through the scope hierarchy, while $broadcast dispatches an event downwards to all child scopes.This has been beautifully explained here. There can be basically two types of scenario while comm...

Modules can be split across many .js files in the same folder. An example in a my_module folder: function_one.js module.exports = function() { return 1; } function_two.js module.exports = function() { return 2; } index.js exports.f_one = require('./function_one.js'); exports.f_two...

1. Install GLFW First step is to create an OpenGL window. GLFW is an Open Source, multi-platform library for creating windows with OpenGL, to install GLFW first download its files from www.glfw.org Extract the GLFW folder and its contents will look like this Download and install CMake to buil...

The Sieve of Eratosthenes generates all the primes from 2 to a given number n. Assume that all numbers (from 2 to n) are prime. Then take the first prime number and removes all of its multiples. Iterate the step 2 for next prime. Continue until all numbers till n have been marked. Pseudocode...

Module is a container for various parts of your applications - controller, services, filters, directive, etc. Why to use Modules Most applications have a main method that instantiates and wires together the different parts of the application. Angular apps don't have main method. But in AngularJ...

Here's how to Handle a popup alert in Java with Selenium: There are 3 types of popups. Simple alert : alert("This is a simple alert"); Confirmation alert : var popuResult = confirm("Confirm pop up with OK and Cancel button"); Prompt alert : var person = prompt(&...

In Unity Editor, open Player Settings (Edit > Project Settings > Player). Under Other Settings, check Virtual Reality Supported. Add or remove VR devices for each build target in the Virtual Reality SDKs list under the checkbox.

What is an exception? Exception in PL/SQL is an error created during a program execution. We have three types of exceptions: Internally defined exceptions Predefined exceptions User-defined exceptions What is an exception handling? Exception handling is a possibility to keep o...

An internally defined exception doesn't have a name, but it has its own code. When to use it? If you know that your database operation might raise specific exceptions those which don't have names, then you can give them names so that you can write exception handlers specifically for them. Otherwis...

Predefined exceptions are internally defined exceptions but they have names. Oracle database raise this type of exceptions automatically. Example create or replace procedure insert_emp is begin insert into emp (emp_id, ename) values ('1','Jon'); exception when dup_val_on_index then ...

As the name suggest user defined exceptions are created by users. If you want to create your own exception you have to: Declare the exception Raise it from your program Create suitable exception handler to catch him. Example I want to update all salaries of workers. But if there are no work...