Lua从值中找到键 [英] Lua find a key from a value

问题描述

我正在处理这个问题:

    chars = {
         ["Nigo Astran"]="1",
         ["pantera"]="2"
         }

   nchar = (chars[$name])+1

变量$ name将给我一个我登录的字符串，在这种情况下:"Nigo Astran" 如果我在"Nigo Astran"中，则nchar的值为"2"，依此类推.我相信您会明白的.

The variable $name will give me a string that I'm logged in to, in this case : "Nigo Astran" and nchar has the value "2" if I'm in "Nigo Astran", and so on. I believe you get the idea.

现在，我想从值中获取键，例如:

Now, I want to get the key from the value, example:

当nchar是2时，应该给我"pantera"作为密钥.我只是没有得到钥匙的价值.

when nchar is 2 it should give me "pantera" as the key. I'm just not getting the value of the key.

推荐答案

如果发现自己需要从表的值中获取键，请考虑按如下所示反转表

If you find yourself needing to get the key from the value of a table, consider inverting the table as in

function table_invert(t)
   local s={}
   for k,v in pairs(t) do
     s[v]=k
   end
   return s
end

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