Creating 2d string indexed tables in Lua

Question

I need to create a table like:

M = {"A"={"a1"=0, "a2"= 1}, "B"={"b1"=2,"b2"=3}}

but this is what I got: " '}' expected near '=' "

Is there anyway to do/simulate this?

Answer 1

foo.bar is the syntactic sugar of foo["bar"], there are no double quotes in the the former syntax:

M = {A = {a1 = 0, a2 = 1}, B = {b1 = 2, b2 =3 }}