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Function as Procedure in Method called on Hashes

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Learn Ruby the Hard Way

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  1. cities = {'CA' => 'San Francisco', 
  2.   'MI' => 'Detroit',
  3.   'FL' => 'Jacksonville'}
  4.  
  5. cities['NY'] = 'New York'
  6. cities['OR'] = 'Portland'
  7.  
  8. def find(list, state) #state is index in hash map
  9.   if list.include? state
  10.     return list[state]
  11.   else
  12.     return "Not found."
  13.   end
  14. end
  15.  
  16. # ok pay attention!
  17. cities[:seek] = method(:find) #put function as proc in methods of hash cities, where index is :seek
  18.  
  19. while true
  20.   print "State? (ENTER to quit) "
  21.   state = gets.chomp
  22.  
  23.   break if state.empty?
  24.  
  25.   # this line is the most important ever! study!
  26.   puts cities[:seek].call(cities, state)
  27. end

URL: http://ruby.learncodethehardway.org/book/ex41.html

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