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class CreateAuthors < ActiveRecord::Migration
  def change
    create_table :authors do |t|
    	t.string :email
    	t.string :password_digest

      t.timestamps
    end
  end
end

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Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

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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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#!/usr/bin/ruby1.9.1 -Kw
# -*- coding: utf-8 -*-

class Edge
  attr_accessor :src, :dst, :length
  
  def initialize(src, dst, length = 1)
    @src = src
    @dst = dst
    @length = length

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require "nokogiri"
require "open-uri"

page = Nokogiri::HTML(open("http://www.cnn.com"))

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gem install nokogiri

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page.css("h2.banner").text 

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page.search("h1", "a").each do |element| 
  puts element.text 
end 

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Array.prototype.shuffle = function(array_elements) {
  var i = array_elements.length, randomNum, randomNumIndex;
  while(--i > 0) {
    randomNum = Math.floor(Math.random() * (i + 1));
     randomNumIndex = array_elements[randomNum];
     array_elements[randomNum] = array_elements[i];
     array_elements[i] = randomNumIndex;
  }
  return array_elements;
};

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var greeet = "Hello world"

function sayHello() { 
  console.log(greet)
}