example

example.rb

class WordReader
  def initialize file
    @file = file
  end
  def read_words
    File.read(@filename).split(/\s+/)
  end
end

class CommonWordRemover
  def initialize common_words
    @common_words = common_words
  end
  def remove_common_words(words)
    words - common_words
  end
end

class WordPresenter
  def initialize words
    @words = words
  end
  def present_words
    puts @words
  end
end

all_words = words = WordReader.new("filename.txt").read_words
uncommon_words = CommonWordRemove.new(["at", "and", "the"]).remove_common_words(all_words)
WordPresenter.new(words).present_words