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Ruby世界：如何把Hash对象键的字符串类型变成为符号类型

由Gudao Luo在2011-03-10 at 22:23发表的

2011-03-10-2144-str2sym-hash
  • 说明
    • 下面参考资料（1）的代码有些错误。
评论: 0 (view/add your own) 标记: Ruby, hash, keys, str2sym, symbols

Ruby代码世界：Array排序代码实例

由Gudao Luo在2009-09-06 at 10:33发表的

2009-09-06 1515

以字符串为元素的Array排序代码清单一
   items = [ "d", "a", "e", "c", "b" ]
   items.sort                                 #从小到大排序，=> ["a", "b", "c", "d", "e"]
   items.sort {|x,y| x <=> y }   #从小到大排序，=> ["a", "b", "c", "d", "e"]
   items.sort {|x,y| y <=> x }   #从大到小排序， => ["e", "d", "c", "b", "a"]
以模型对象为元素的Array排序代码清单二
class Company
  attr_accessor :nr
  attr_accessor :name
  def initialize(nr, name)
    @nr = nr
    @name = name
  end
end
objects = [Company.new(2, "d"), Company.new(1, "a"), Company.new(3, "e")]
objects.sort {|x,y| x.name <=> y.name } 
#以模型对象元素name进行模型对象的排序结果：
#=>  objects = [Company.new(1, "a"), Company.new(2, "d"), Company.new(3, "e")]
评论: 0 (view/add your own) 标记: Codes, Ruby, array, hash, sort