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Exercise 3

Using some of Ruby's built-in Hash methods, write a program that loops through a hash and prints all of the keys. Then write a program that does the same thing except printing the values. Finally, write a program that prints both.

Solution

opposites = {positive: "negative", up: "down", right: "left"}

opposites.each_key { |key| puts key }
opposites.each_value { |value| puts value }
opposites.each { |key, value| puts "The opposite of #{key} is #{value}" }

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