带更改变量的 Lua 表 - Mental Block
我一直认为将 k 的值从 "x" 更改为 20 会消除 "x"。那么为什么在这个例子中我们能够返回并引用 "x" 呢？
a = {}
k = "x"
a[k] = 10
print(a[k]) ---> Returns 10
print(a["x"]) ---> Returns 10
a[20] = "great"
k = 20
print(a[k]) ---> "great"
a["x"] = a["x"] + 1
print(a["x"]) --> 11
为什么最后一个打印命令有效并返回11？我以为我们设置了k = 20。为什么“x”也在图片中？
I always assumed that changing the value of k from "x" to 20 would eliminate "x". So why then in this example are we able to go back and reference "x"?
a = {}
k = "x"
a[k] = 10
print(a[k]) ---> Returns 10
print(a["x"]) ---> Returns 10
a[20] = "great"
k = 20
print(a[k]) ---> "great"
a["x"] = a["x"] + 1
print(a["x"]) --> 11
Why does that last print command work, and return 11? I thought we set k = 20. Why is "x" even in the picture?
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Lua 将表称为其他编程语言中的字典或哈希，表是存储一对键和值的数据结构，表中不能有两个相同的键，但不同的键可以具有相同的值。所以基本上你在第2行中所做的就是给你的变量“k”值“x”，在第3行你说表“a”将有一个值为10的条目，该条目由键“x”而不是变量引用“k”，变量“k”是一个地址而不是一个值。
我希望我能有所帮助。
Lua calls table what others programming languages call dictionary or hash, a table is a data structure that stores a pairs of key and value, we can not have two identical keys in a table, but we can have same values for diferent keys. So basicly what you are doing in line 2 is giving your variable "k" value "x", on line 3 you are saying that the table "a" will have an entry with value 10 which is referenced by key "x" not variable "k", variable "k" is a anddress not a value.
I hope I helped somehow.