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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

So you're curious in learning this new thing called (Functional) Reactive Programming (FRP).

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

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from scapy.all import *
import requests
import time
MAGIC_FORM_URL = 'http://put-your-url-here'

def record_poop():
  data = {
    "Timestamp": time.strftime("%Y-%m-%d %H:%M"), 
    "Measurement": 'Poopy Diaper'
  }

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# Helper method to adding the fixtures into the tests
def fixtures(*files)
  files.each do |file|
    klass = begin
      Kernel::const_get(Extlib::Inflection.classify(Extlib::Inflection.singularize(file.to_s)))
    rescue
      nil
    end
    entries = YAML::load_file(File.dirname(__FILE__) + "/fixtures/#{file}.yml")
    # do a migrate to create the table to clear the records

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# spec_helper.rb
# Helper method to adding the fixtures into the tests
def fixtures(*files)
  files.each do |file|
    klass = begin
      Kernel::const_get(
          Extlib::Inflection.classify(
                Extlib::Inflection.singularize(file.to_s)))
    rescue
      nil

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# create a link to an action. A confirm box will pop up before 
# you can process to action specified here.
# link_to_action "Delete", "Are you sure?", :method => 'delete', 
#  :class => "negative", :controller => 'price_letters', 
#  :action => 'destroy', :id => letter.id
# link_to_action "Effect Now", "Take effect now, and can not be reversed?",
#  :controller => "price_letters", :action => 'effect_now', :id => letter.id
def link_to_action(link_text, msg = "Are you sure", attributes = {})
  content = (msg || "Are you sure?")
  attrs = { :method => 'post' }

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<VirtualHost *:80>
    ServerName app.myapp.com
    DocumentRoot /Users/zhonghai/apps/ruby/current/public
    # setting the env to development
    RackEnv development
</VirtualHost>

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# setting the env to development
RackEnv development
<VirtualHost *:80>
    ServerName app.myapp.com
    DocumentRoot /Users/zhonghai/apps/ruby/current/public
</VirtualHost>

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zooo = Zoo.all
File.open('zoo.yaml', 'w'){|f| f.puts zooo.to_yaml}

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# dm 0.9.8 breaks YAML.dump
zooo = Zoo.all
File.open('zoo.yaml', 'w'){|f| YAML.dump(zooo, f)}

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z1 = Zoo.all(:condition.....) 
z1.to_yaml # this OK
 
z2 = Zoo.all(:condition...) 
z2.to_yaml # this OK
 
z3 = z1 + z2 
z3.to_yaml # bam!. ERROR