the first Ruby sample

最新推荐文章于 2025-08-24 15:59:39 发布

转载最新推荐文章于 2025-08-24 15:59:39 发布 · 694 阅读

本文介绍了一个使用 Ruby 编写的 MegaGreeter 类，该类能够根据不同情况个性化地打招呼和告别。通过实例化 MegaGreeter 对象并设置名字属性，可以实现对单个或多个名字的问候与道别。


#!/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.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')
			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 'jacky'
	mg.names = 'jacky'.capitalize
	mg.say_hi
	mg.say_bye

	# Change the name to an array of names
	mg.names = ['Tom','Jack','Kate']
	mg.say_hi
	mg.say_bye

	# Change to nil
	mg.names = nil 
	mg.say_hi
	mg.say_bye
end