arrays - 在 Lua 中从 0 开始表的索引

Question

我想设置表成员的索引，但还是要命名。这可能吗？

local table = {
    ["cat"] = {
        ["fish"] = { stuff = "bla1", stuff2 = "bla" },
        ["mouse"] = { stuff = "bla2", stuff2 = "bla" },
        ["bird"] = { stuff = "bla3", stuff2 = "bla" },
    },
    ["dog"] = {
        ["fish"] = { stuff = "bla1", stuff2 = "bla" },
        ["mouse"] = { stuff = "bla2", stuff2 = "bla" },
        ["bird"] = { stuff = "bla3", stuff2 = "bla" },
    },
}

table["cat"][1] 是 fish，但我希望 table["cat"][0] 是fish，我该如何实现？

编辑:我仍然希望能够使用 table["cat"]["fish"] 访问 fish。

编辑2:

当我尝试反之时会怎样？ http://repl.it/MCu我做错了什么？

Answer 1

只是为了澄清 table["cat"][1] 不是 fish -- 你上面的表格示例没有用表的索引部分。要使用表的索引部分，键本身必须是整数。

修改上面的示例:

local animal = {
    cat = {
        fish = { stuff = "bla", stuff2 = "bla" },
        mouse = { stuff = "bla", stuff2 = "bla" },
        bird = { stuff = "bla", stuff2 = "bla" },
    },
    dog = {
        fish = { stuff = "bla", stuff2 = "bla" },
        mouse = { stuff = "bla", stuff2 = "bla" },
        bird = { stuff = "bla", stuff2 = "bla" },
    },
}

如果您希望 animal.cat.fish 和 animal.cat[1] 具有相同的值(相同的 lua 表)，只需进行常规赋值即可:

animal.cat[1] = animal.cat.fish
-- and likewise if you want index 0:
animal.cat[0] = animal.cat.fish

请注意，许多使用表的标准 lua 函数都是从 1 开始计数的。