如何在ruby中对嵌套哈希进行排序？

Question

example_hash = {
  "1" => {"occurence": 12, "display": ""},
  "2" => {"occurence": 15, "display": ""},
  "3" => {"occurence": 16, "display": ""}
}

对于上面给定的嵌套哈希，我们如何根据出现值对它进行排序（降序）。结果应按[3,2,1]

的顺序显示键

Answer 1

example_hash.sort_by { |_,h| -h[:occurrence] }
  #=> [["3", {:occurrence=>16, :display=>""}],
  #    ["2", {:occurrence=>15, :display=>""}],
  #    ["1", {:occurrence=>12, :display=>""}]]

如果需要散列，请.to_h进行修改，但通常不希望使用以特定方式排序的键来进行散列。

Answer 2

在控制台中，这是

example_hash.sort{|a,b| b[1][:occurence] <=> a[1][:occurence]}.to_h

返回此：

{"3"=>{:occurence=>16, :display=>""}, "2"=>{:occurence=>15, :display=>""}, "1"=>{:occurence=>12, :display=>""}}

顺便说一句，我相信您拼错了“出现率”。