gistfile1.txt

class Dictionary
attr_accessor :entries
attr_accessor :keywords
 
def initialize
@x = Hash.new
end
 
def entries
@x
end
 
def add(hash)
 hash.class == String ? @x[hash] = nil : @x.merge!(hash)
end

def keywords
@x.keys
end
 
end
d = Dictionary.new
d.add({'fish' => 'aquatic animal'})
d.add('tiger')
puts d.keywords