Created
November 9, 2018 00:20
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| #!/usr/bin/env ruby | |
| class MegaGreeter | |
| attr_accessor :names | |
| # Create the object | |
| def initialize(names = "World") | |
| @names = names | |
| end | |
| # Say hi to everybody | |
| def say_hi | |
| if @names.nil? | |
| puts "..." | |
| elsif @names.respond_to?(:each) | |
| # @names is a list of some kind, iterate! | |
| @names.each do |name| | |
| puts "Hello #{name}!" | |
| end | |
| else | |
| puts "Hello #{@names}!" | |
| end | |
| end | |
| # Say bye to everybody | |
| def say_bye | |
| if @names.nil? | |
| puts "..." | |
| elsif @names.respond_to?("join") | |
| # Join the list elements with commas | |
| puts "Goodbye #{@names.join(", ")}. Come back soon!" | |
| else | |
| puts "Goodbye #{@names}. Come back soon!" | |
| end | |
| end | |
| end | |
| if __FILE__ == $0 | |
| mg = MegaGreeter.new | |
| mg.say_hi | |
| mg.say_bye | |
| # Change name to be "Zeke" | |
| mg.names = "Zeke" | |
| mg.say_hi | |
| mg.say_bye | |
| # Change the name to an array of names | |
| mg.names = ["Albert", "Brenda", "Charles", | |
| "Dave", "Engelbert"] | |
| mg.say_hi | |
| mg.say_bye | |
| # Change to nil | |
| mg.names = nil | |
| mg.say_hi | |
| mg.say_bye | |
| end |
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