Question

试图找出一种从哈希散列中获取最大/最小值的方法。例如，我希望得到死亡率最高的玩家和杀死率最高的玩家。

哈希示例：

{ 1234 => 
     { :steamID => 1234,
       :alias => "Bob",
       :kills => "50",
       :deaths => "10"
     },
  5678 => 
     { :steamID => 5678,
       :alias => "Jim",
       :kills => "10",
       :deaths => "12"
     },
}

尝试输出类似的内容：

{ :most_kills => 
    { :steamID => 12345, 
      :name => "Bob", 
      :stat => "50"}, 
  :most_deaths => 
    { :steamID => 12345, 
      :name => "Bob", 
      :stat => "50"
    }
 }

Answer 1

以下内容将找到具有最大杀死和死亡统计数据的玩家，并将输出映射到所需格式：

input = { 1234 =>
  { steamID: 1234,
    alias: "Bob",
    kills: "50",
    deaths: "10"
  },
  5678 =>
   { steamID: 5678,
     alias: "Jim",
     kills: "10",
     deaths: "12"
   },
}

output = [:kills, :deaths].each_with_object({}) do |stat, h|
  max = input.max_by {|k,v| v[stat]}

  h["most_#{stat}".to_sym] = {
    :steamID => max[0],
    :name => max[1][:alias],
    :stat => max[1][stat]
  }
end

输出结果为：

{
  :most_kills => {
    :steamID => 1234, 
    :name => "Bob", 
    :stat => "50"
  }, 
  :most_deaths => {
    :steamID => 5678,
    :name => "Jim", 
    :stat => "12"
  }
}

Answer 2

我可能这样写：

def most(input, key_name)
  _, v = input.max_by { |_,v| v[key_name.to_sym] }
 [("most_#{key_name}").to_sym, v]
end

["deaths", "kills"].map {|key_name| most(input, key_name) }.to_h
   #=> {:most_deaths=>{:steamID=>5678, :alias=>"Jim",
   #                   :kills=>"10", :deaths=>"12"},
   #    :most_kills =>{:steamID=>1234, :alias=>"Bob",
   #                   :kills=>"50", :deaths=>"10"}}

查找散列哈希键的最大值

2 个答案: