Re-learning Lua

for x = 0, 10, 1 do print(x) end -- for loop with range and step. step if not given is assumed to be 1
-- Tables are the soul of Lua. They double up as arrays and hashes
a = {}
b = {1, 2, 3}
b[1]
-- b[1] will return 1 as indexing for arrays is from 1
c = {[0]={123,3},["a"]={1,2,3},v={2,6,7}}
-- We can have a "0"th index by adding the 1st element as [0]=value
-- Adding keys which are not valid identifiers in Lua needs to be done by wrapping key in []
-- If a key is a valid identifier, we can access using `.` e.g c.a for above code vs c[0]
for k,v in pairs(c) do print(type(k)) end -- iterates through k/v in table and prints type of key

function printTable(tbl)
		-- Specify function vars as local else they become global
        local s = "{"
        local fst = true
        for k,v in pairs(tbl) do
        	    local tk = type(k)
        	    local tv = type(v)
                if not fst then
                        s = s .. ","
                else
                        fst = false
                end
                
                if tk == "number" or tk == "boolean" then
                        s = s .. "[" .. tostring(k) .. "]="
                else
                        s = s .. '["' .. k .. '"]='
                end
                
                if tv == "table" then
                    s = s .. printTable(v)
                elseif tv == "number" or tv == "boolean" then
                    s = s .. tostring(v)
                elseif tv == "string" then
                    s = s .. '"' .. v .. '"'
                else
                	s = s .. vt
                end
        end
        s = s .. "}"
        return s
end

sv = printTable({[0]={123,3},["a"]={1,2,3},v={2,6,7},[true]=123})
print(sv)

-- posts.lua (saved table) can be read from another lua file as posts=require("posts")
return {[0]={[1]=123,[2]=3},["v"]={[1]=2,[2]=6,[3]=7},["a"]={[1]=1,[2]=2,[3]=3},[true]=123}