如何在Ruby中实现注入？ [英] How to implement injection in Ruby?

问题描述

  h = x.inject（{}）{| a， C | a [b.one] = b.two; a} 
  

其中x是Couple对象的序列（它们只包含两个数字字段，一个和两个）。

我不确定如何在Couple中实现注入方法。 在中定义一个 #each 夫妻，然后在其中包含 Enumerable 。

  class Couple 
 def each 
 yielda
 yieldb
 end 
 
 include Enumerable 
 end 
 
 couple = Couple.new 
 couple.inject（）{| str，obj | str + obj} 
＃=> ab
  

http://www.ruby-doc.org/core-1.9.3/Enumerable.html

I need to be able to use this call:

h = x.inject({}) {|a, b| a[b.one] = b.two; a}

Where x is a sequence of Couple objects (these just contain two number fields, one and two).

I am not sure how to implement the inject method in Couple.

解决方案

Define an #each method in Couple, then include Enumerable in it.

class Couple
  def each
    yield "a"
    yield "b"
  end

  include Enumerable
end

couple = Couple.new
couple.inject("") { |str, obj| str + obj }
# => "ab"

http://www.ruby-doc.org/core-1.9.3/Enumerable.html

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