假设我有以下数据集
[ { :name => "sam",:animal => "dog",:gender => "male" },{ :name => "max",:animal => "cat",:gender => "female" },{ :name => "joe",:animal => "snake",:gender => "male" } ]
你如何将哈希数组分组为:
{ :name => ["sam","max","joe"] :animal => ["dog","cat","snake"] :gender => ["male","female","male"] }
我读过类似的文章,如this和Group array of hashes by key
但是,大多数示例将值返回为增量计数,其中我正在寻找实际的单独值.
我的尝试
keys = [] values = [] arr.each do |a| a.each do |k,v| keys << k #this is where it goes wrong and where I'm stuck at values << v end end keys = keys.uniq
我明白我出错的地方是我如何分割价值观.任何方向将不胜感激!
解决方法
input.reduce { |e,acc| acc.merge(e) { |_,e1,e2| [*e2,*e1] } } #⇒ {:name=>["sam","joe"],# :animal=>["dog","snake"],# :gender=>["male","male"]}
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