authors.rb

require 'open-uri'
require 'json'

thread = "http://www.reddit.com/r/millionairemakers/comments/2na6tu/reddit_lets_make_a_millionaire.json"

def get_authors(thread)
  json_content = JSON.parse(open(thread).read)
  json_content[1]["data"]["children"].inject([]) do |arr, p|
    arr << p["data"]["author"]
    arr
  end
end

authors = get_authors(thread)

puts "Number of total posters:\t #{authors.size}"
puts "Number of unique posters:\t #{ authors.uniq.size }"

unless authors.size == authors.uniq.size
  perps = authors.group_by { |e| e }.select { |k, v| v.size > 1 }.map(&:first)
  puts "\n--- USERS BREAKING THE RULES ---\n"
  puts
  perps.each do |u|
    puts u
  end
  puts "\n\n"
end