palindrome.rb

def filter(string)
  string.tr(',', '').tr(' ', '').tr('-', '')
end

def compare(string)
  orig = filter(string).downcase
  reversed = filter(string).reverse.downcase
  orig == reversed 
end 

string = 'A man, a plan, a cat, a ham, a yak, a yam, a hat, a canal-Panama'
puts compare(string)