3lttr.rb

# frozen_string_literal: true

require 'whois'
require 'whois-parser'

words = File.readlines('/usr/share/dict/words')

whois = Whois::Client.new(timeout: 10)

domains = words
          .map(&:downcase)
          .uniq
          .map do |word|
            word = word.strip
            next if word.size > 3 || word.size == 1

            domain = "#{word}.com"
            print "Checking #{domain}"

            begin
              record = whois.lookup(domain)
              parser = record.parser
              puts parser.available? ? ' available' : ' taken'
              {
                domain: domain,
                registered: parser.registered?,
                available: parser.available?
              }
            rescue StandardError => e
              puts "Failed: #{e.message}"
              {
                domain: domain,
                registered: 'error',
                available: 'error'
              }
            end
          end

File.open('result.txt', 'w+') do |f|
  f.puts(domains.compact)
end