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def pmap(enum)
  return to_enum(:pmap, enum) unless block_given?
  enum.map { |e| Thread.new { yield e } }.map(&:value)
end

# Returns elements in order, as expected.
pmap(1..10) { |e| e } #=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

# Returns elements in nondeterministic order on MRI >= 1.9.3.
# Works as expected on JRuby, Rubinius, and earlier versions of MRI.

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require 'csv'
require 'twitter'

def twitter_client
  @twitter_client ||= Twitter::REST::Client.new do |config|
    config.consumer_key = 'XXXXXX'
    config.consumer_secret = 'XXXXXX'
    config.access_token = 'XXXXXX'
    config.access_token_secret = 'XXXXXX'
  end

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require 'set'

module Lotus
  module Action
    module Exposable
      def self.included(base)
        base.extend(ClassMethods)
      end

      module ClassMethods

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<script type="text/javascript">
  $(document).ready(function(){
    $.stratus({
      key: "Enter your Client ID here",
      links: "https://soundcloud.com/zedsdead/sets/somewhere-else-ep"
    });
  });
</script>

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<script type="text/javascript">
  $(document).ready(function(){
    $.stratus({
      auto_play: true,
      download: false,
      key: "Enter your Client ID here",
      links: 'http://soundcloud.com/qotsa',
      random: true
    });
  });

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def valid?(card_number)
  digits = card_number
             .split("")
             .map { |number| number.to_i }

  numbers = []
  digits.each_with_index do |digit, index|
    if index.even?
      numbers << digit * 2
    else

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require 'benchmark/ips'
require 'ostruct'

N = 100
ATTRS = (:aa..:zz).take(N)
HASH = Hash[ATTRS.map { |x| [x, x] }]

CStruct = Struct.new(*ATTRS)

def struct

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What is the system Ruby?

What version of Ruby shipped by default on Mac OS X?

Default Ruby version * Refers to the fully patched version (e.g. 10.5.8, not 10.5.0). Earlier versions may have shipped with different Ruby patchlevels but the RUBY_VERSION has never changed within major Mac OS X releases.

Mac OS X version*	Mac OS X release date

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module Enumerable
  def first_to_finish
    threads = collect { |args| Thread.new { yield(args) } }
    loop until done = threads.detect { |t| !t.alive? }
    threads.each(&:kill)
    done.value
  end
end

puts [5, 3, 1, 2, 4].first_to_finish { |x| sleep x }

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digraph G {
  label="Caddy Architecture"
  labelloc="top"
  fontsize=20
  fontname="Helvetica Neue"
  node [shape="ellipse", style="filled", fontname="Helvetica Neue"]
  edge [fontname="Helvetica Neue"]
  peripheries=0
  rankdir="LR"
  subgraph clusterClient {