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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 Reactive Programming, particularly its variant comprising of Rx, Bacon.js, RAC, and others.

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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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

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ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCi5GB0RhKDDKGZ2zPjw7Mw13EF/KQIHcWqaZ5GZ+DCqXMky5qdK+JO0ZLFZha0a+K0zESbAIhi4FPNRccg3Bh+bFx9HWpyoXTgdQpYgpAIIuOJRLfdI3IUvXzrmejTKwBxYTl1wv3OvvWaFZTFSOaAf6Hfs5/MbNJoua1XuKv6jydehEmDhcfLWUixlOeojut8ehK8PB5A9NknztxmLs5QNygtVrOWbirJ4u2EgZbX3Y7trGBb9H1LdW1iJ6xG5QuvY9sxrBSFNd0/vitJ+dMR6WHQsQzzbZZbs6g849NqVpMb1g1mCyknkxCMsCbSNmo81BBoz3oQHMTjE0/6NWSX viktor@linux

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class Environment

  attr_reader :vars, :parent

  def initialize(parent = nil)
    @parent = parent
    @vars   = parent ? parent.vars.clone : {}
  end

  def extend_env

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= form_for :article, url: articles_path do |f|
  = @article
  - if @article.errors.any?
    #error_explanation
      %h2 Ошибки при создании статьи:
      %ul
        - @article.errors.full_messages.each do |msg|
          %li
            = msg
  %p

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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<?php

class App_ArrayInterfaceTest extends PHPUnit_Framework_TestCase {

    public function testArrayInterface() {
        $mock = $this->getMock('App_ArrayInterface');
        $this->assertTrue($mock instanceof App_ArrayInterface);

        $interface = new ReflectionClass('App_ArrayInterface');
        $this->assertTrue($interface->hasMethod('toArray'));

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<IfModule filter_module>
<IfModule version.c>
  <IfVersion <= 2.2>
    FilterDeclare   COMPRESS
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/html
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/css
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/plain
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/xml
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/x-component
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/javascript

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<h1 class="loader">
  <span>З</span>
  <span>а</span>
  <span>г</span>
  <span>р</span>
  <span>у</span>
  <span>з</span>
  <span>к</span>
  <span>а</span>
</h1>

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<h1 class="text"><span>Gradient 3D text</span></h1>
<style>
	body {
		background-color: #272727;
	}

	h1 {
        font-family: "Arial", sans-serif;
        font-size: 85px;
        text-align: center;