Another solution to this post (http://jumpstartlab.com/news/archives/2013/04/23/the-death-of-ifs) with Objects.

death_of_ifs.rb

def start
  command = ""
  command_processor = CommandProcessor.new
  command_processor.add_command('follow', 'following')
  while command != "q"
    printf "enter command: "
    command = gets.chomp
    command_processor.process(command)
  end
end
 
class CommandProcessor
  def initialize
    @commands = Hash.new
    @commands[:q] = "Goodbye"
    @commands[:tweet] = "tweeting"
    @commands[:dm] = "direct messaging"
    @commands[:help] = "helping"
  end

  def add_command(command, output)
    @commands[command.to_sym] = output
  end

  def process(input)
    puts @commands[input.to_sym]
  end
end