Created
April 23, 2012 06:38
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Ruby in Twenty Minutes i.e. http://www.ruby-lang.org/en/documentation/quickstart/3/
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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", "Englebert"] | |
mg.say_hi | |
mg.say_bye | |
# Change to nil | |
mg.names = nil | |
mg.say_hi | |
mg.say_bye | |
end |
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