如何實現Hash＃all？多維哈希？

Question

考慮到我有這些散列：

h1 = {"a" => { "b" => 1, "c" => {"d" => 2, "e" => 3} } } 
h2 = {"a" => { "b" => 1, "c" => nil } } 

而且我希望這些結果：

h1.multi_all? # true 
h2.multi_all? # false 

我將如何實現multi_all方法？

Answer 1

class Hash 
    def multi_all? &block 
    all? do |key, value| 
     if value.is_a?(Hash) 
     value.multi_all?(&block) 
     elsif block == nil 
     value 
     else 
     block[key, value] 
     end 
    end 
    end 
end 

Answer 2

class Hash 
    def values_r # recursive values 
    self.values.map do |x| 
     x.is_a?(Hash) ? x.values_r : x 
    end 
    end 
end 

h1.values_r.flatten.all? 

PS：你知道嗎all?方法也接受塊嗎？