learn ruby the hard way

hash_ex.rb

cities = {'CA' => 'San Francisco', 'MI' => 'Detroit', 'FL' => 'Jacksonville'}
 
cities['NY'] = 'New York'
cities['OR'] = 'Portland'
 
def find_city(map, state)
  if map.include? state
    return map[state]
  else
    return "Not found."
  end
end
 
while true
  print "State? (Enter to quit) "
  state = gets.chomp
 
  break if state.empty?
 
  puts find_city(cities, state)
end