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defmodule Chop do
  def guess(actual, range = low..high) when actual >= low and actual <= high do
    _guess(actual, ask(div(low + high, 2)), range)
  end


  defp _guess(actual, actual, _) do
    IO.puts "\nYES! It is #{actual}\n"
  end

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Ruby

• Try Ruby
• Mr. Neighborly's Humble Little Ruby Book
• Rubymonk

Rails

• Rails for Zombies Redux
• Ruby on Rails Tutorial

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# Set prefix to Ctrl-a
set -g prefix C-a
bind C-a send-prefix

# Unbind previous Ctrl-b prefix
unbind C-b

# Change default delay between keystrokes
set -s escape-time 1

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# Compiled source #
###################
*.com
*.class
*.dll
*.exe
*.o
*.so

# Packages #

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class FullUrlValidator < ActiveModel::EachValidator
  VALID_SCHEMES = %w(http https)

  def validate_each(record, attribute, value)
    unless valid_full_url?(value)
      record.errors[attribute] << (options[:message] || 'is not a valid URL')
    end
  end

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def if_multiple_pages?(collection, per_page = 10)
  pages = (collection.size / (per_page || 10).to_f).ceil
  yield pages if pages > 1
end

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class Product < ActiveRecord::Base
  # ... other code

  has_and_belongs_to_many :products,
                          :join_table => "related_products",
                          :foreign_key => "product_a_id",
                          :association_foreign_key => "product_b_id",
                          :finder_sql => 'SELECT DISTINCT products.* FROM products INNER JOIN related_products ON (#{id} = related_products.product_a_id OR #{id} = related_products.product_b_id) WHERE (products.id <> #{id})',
                          :insert_sql => 'INSERT INTO related_products (product_a_id, product_b_id) VALUES (#{id}, #{record.id})',
                          :delete_sql => 'DELETE FROM related_products WHERE (product_a_id = #{id} AND product_b_id IN (#{record.id})) OR (product_a_id = #{record.id} AND product_b_id IN (#{id}))',

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class Category < ActiveRecord::Base
  has_many :categories, :order => 'order_by asc'
  belongs_to :category

  scope :order, order("order_by asc")
  scope :main, where(:category_id => nil)

  def options_for_select( selected = nil )
    selected_attribute = ' selected="selected"' if self == selected
    options_output = "<option value='#{self.id}'#{selected_attribute}>#{self.title}</option>"

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#
# Credit goes to jamis
# http://37signals.com/svn/posts/2742-the-road-to-faster-tests

#
# wipe almost all of the instance variables from the object

teardown :scrub_instance_variables

@@reserved_ivars = %w(@loaded_fixtures @test_passed @fixture_cache @method_name @_assertion_wrapped @_result)

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Factory.define :album do |album|
  album.name 'Album Name'
  album.description 'Album Description'
  album.active true
  album.association :cover_image, :factory => :image
end