rudy unixc3t

Setting up and installing rbenv, ruby-build, rubies, rbenv-gemset, and bundler

This guide enables you to install (ruby-build) and use (rbenv) multiple versions of ruby, isolate project gems (gemsets and/or bundler), and automatically use appropriate combinations of rubies and gems.

TL;DR Demo

# Ensure system is in ship-shape.

aptitude install git zsh libssl-dev zlib1g-dev libreadline-dev libyaml-dev

API workthough

Open a browser

# start an instance of firefox with selenium-webdriver
driver = Selenium::WebDriver.for :firefox
# :chrome -> chrome
# :ie     -> iexplore

Go to a specified URL

This is a quick guide to Kotlin programming language. The previous part of this guide is here

#Object Oriented

fun main(args : Array<String>) {
  class local (val x : Int)
  
  val y = local(10)
 println("${y.x}")

#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

Elixir installation guide

Version numbers should be the ones you want. Here I do it with the last ones available at the moment of writing.

The simplest way to install elixir is using your package manager. Sadly, at the time of writing only Fedora shows the intention to keep its packages up to date. There you can simply sudo dnf install erlang elixir and you are good to go.

Anyway, if you intend to work with several versions of erlang or elixir at the same time, or you are tied to a specific version, you will need to compile it yourself. Then asdf is your best friend.

	#Model

	@user.should have(1).error_on(:username) # Checks whether there is an error in username
	@user.errors[:username].should include("can't be blank") # check for the error message

	#Rendering
	response.should render_template(:index)

	#Redirecting
	response.should redirect_to(movies_path)

	require "active_record"

	namespace :db do

	db_config = YAML::load(File.open('config/database.yml'))
	db_config_admin = db_config.merge({'database' => 'postgres', 'schema_search_path' => 'public'})

	desc "Create the database"
	task :create do
	ActiveRecord::Base.establish_connection(db_config_admin)

	(source "melpa" "http://melpa.milkbox.net/packages/")
	(source "gnu" "http://elpa.gnu.org/packages/")
	(source "marmalade" "http://marmalade-repo.org/packages/")

	(depends-on "ac-js2")
	(depends-on "adaptive-wrap")
	(depends-on "ag")
	(depends-on "auto-complete")
	(depends-on "calfw")
	(depends-on "cask")

	(setq enh-ruby-program "/home/gnufied/.rbenv/versions/1.9.3-p448/bin/ruby")
	(autoload 'enh-ruby-mode "enh-ruby-mode" "Major mode for ruby files" t)
	(add-to-list 'auto-mode-alist '("\\.rb$" . enh-ruby-mode))
	(add-to-list 'auto-mode-alist '("\\.rake$" . enh-ruby-mode))
	(add-to-list 'auto-mode-alist '("Rakefile$" . enh-ruby-mode))
	(add-to-list 'auto-mode-alist '("\\.gemspec$" . enh-ruby-mode))
	(add-to-list 'auto-mode-alist '("\\.ru$" . enh-ruby-mode))
	(add-to-list 'auto-mode-alist '("Gemfile$" . enh-ruby-mode))

	(add-to-list 'interpreter-mode-alist '("ruby" . enh-ruby-mode))