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class Tree
def initialize
puts "Make a normal tree"
end
def decorate
puts "Make sure the tree won\'t fall"
end
end
class RedBalls < Tree
def initialize(tree)
@parent = tree;
end
def decorate
@parent.decorate
puts "Put on some red balls"
end
end ......

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Éý¼¶µ½snow leopardºórubyµÄÎÊÌâ

1. rubyÒѳÉΪ1.87 2. ±ØÐëÏȰ²×°°²×°¹âÅÌÀïµÄеÄxcode£¬ÔÚ"optional"Ŀ¼Àï 3. ¿ÉÄÜÐèÒªÖØÐ°²×°macport http://trac.macports.org/wiki/Migration 4. »òÕßÉý¼¶macport http://weblog.rubyonrails.org/2009/8/30/upgrading-to-snow-leopard $ sudo port selfupdate
$ sudo port sync
$ sudo port upgrade --force insta ......

Rubyѧϰ±Ê¼ÇËÄ——Ä£¿é


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#¶¨ÒåÄ£¿éÓÃmodule...end ¡£Ä£¿éÓëÀà·Ç³£ÏàËÆ£¬µ«ÊÇ£º
#A) Ä£¿é²»¿ÉÒÔÓÐʵÀý¶ÔÏó£»
#B) Ä£¿é²»¿ÉÒÔÓÐ×ÓÀà¡£
include Math
puts sqrt(91);
module Me
  def sqrt(a)
  puts a*a;
  return a*a;
end
PI=3.1415926 ......
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