LRtHW PDF Exercise 40

gistfile1.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

# ok pay attention!
cities[:find] = method(:find_city)

while true
    print "State? (ENTER to quit) "
    state = gets.chomp
  
    break if state.empty?

    # this line is the most important ever! study!
    puts cities[:find].call(cities, state)
end

I take it this was a lesson from something? Otherwise I don't get why lines 5 & 6 aren't declared in the initial hash.