使用索引或值的Lua搜索表 [英] Lua search tables using index or value

问题描述

所以，如果我有一张颜色表:

So if I have a table of colours:

colour["red"] = 1
colour["blue"] = 4
colour["purple"] = 5

我想将红色添加到蓝色，我可以很容易地获得红色和蓝色的数字值，但是如果值为5，是否可以使它返回紫色"而无需扫描整个表?

and I want to add red to blue, I can easily get the number values of red and blue, but then with the value 5, can I get it to return "purple" without scanning the whole table?

推荐答案

如果色号是唯一的，则需要一个同时包含哈希和数组部分的表.例如:

You would need a table with both hash and array part, if colour numbers are unique. For example:

colour["purple"] = 5
colour[5] = "purple"

您可以创建一个帮助程序的小助手功能，例如:

You can create a little helper function that would facilitate populating the table, such as:

function addColour(coltab, str, val)
    coltab[str] = val
    coltab[val] = str
end

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