staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

dqminh

require "rspec/core/formatters/progress_formatter"

class ApplauseFormatter < RSpec::Core::Formatters::ProgressFormatter
  def initialize(output)
    super(output)
    unless File.exists? "/tmp/applause.mp3"
      p "Downloading applause for awesomeness"
      system "wget http://www.soundjay.com/human/applause-1.mp3 -O /tmp/applause.mp3"
    end
  end

mostlyobvious

class InitializerStruct
  def self.new(*args)
    Class.new do
      define_method(:initialize) do |*initializer_args|
        arity_error = ArgumentError.new("wrong number of arguments (#{initializer_args.size} for #{args.size})")
        raise arity_error unless initializer_args.size == args.size

        args.each do |arg|
          instance_variable_set("@#{arg}", initializer_args.shift)
        end

SzymonPobiega

If you have two days to learn the very basics of modelling, Domain-Driven Design, CQRS and Event Sourcing, here's what you should do:

In the evenings read the [Domain-Driven Design Quickly Minibook]{http://www.infoq.com/minibooks/domain-driven-design-quickly}. During the day watch following great videos (in this order):

1. Eric Evans' [What I've learned about DDD since the book]{http://www.infoq.com/presentations/ddd-eric-evans}
2. Eric Evans' [Strategic Design - Responsibility Traps]{http://www.infoq.com/presentations/design-strategic-eric-evans}
3. Udi Dahan's [Avoid a Failed SOA: Business & Autonomous Components to the Rescue]{http://www.infoq.com/presentations/SOA-Business-Autonomous-Components}
4. Udi Dahan's [Command-Query Responsibility Segregation]{http://www.infoq.com/presentations/Command-Query-Responsibility-Segregation}
5. Greg Young's [Unshackle Your Domain]{http://www.infoq.com/presentations/greg-young-unshackle-qcon08}
6. Eric Evans' [Acknowledging CAP at the Root -- in the Domain Model]{ht

ksarna

# You can use this class in your console. For example
#   p = ProfilingTools.new
#   p.profiled_request(:controller => :welcome, :action => :index)
# this will profile whole application stack and save file in your tmp/profiler folder
# You can also use +request+ method just to see the output for example:
#
#   p.request(:controller => :offers, :action => :index)
#   
#   p.response.body
#   p.response.cookies # and so on