-- In Lua, we don't need to import packages like in Go
-- We'll use the print function for output

-- Create an empty table (similar to an uninitialized slice in Go)
local s = {}
print("uninit:", #s, #s == 0)

-- Create a table with initial values (similar to make([]string, 3) in Go)
s = {"", "", ""}
print("emp:", s, "len:", #s)

-- We can set and get values just like with arrays
s[1] = "a"
s[2] = "b"
s[3] = "c"
print("set:", s)
print("get:", s[3])

-- #s returns the length of the table
print("len:", #s)

-- To append elements, we can use the insert function or direct assignment
table.insert(s, "d")
s[#s + 1] = "e"
s[#s + 1] = "f"
print("apd:", s)

-- To copy a table, we need to create a new table and copy elements
local c = {}
for i = 1, #s do
    c[i] = s[i]
end
print("cpy:", c)

-- Lua tables support slicing using the unpack function
local function slice(t, start, stop)
    local sliced = {}
    for i = start, stop or #t do
        table.insert(sliced, t[i])
    end
    return sliced
end

local l = slice(s, 3, 5)
print("sl1:", l)

l = slice(s, 1, 5)
print("sl2:", l)

l = slice(s, 3)
print("sl3:", l)

-- We can declare and initialize a table in a single line
local t = {"g", "h", "i"}
print("dcl:", t)

-- Lua doesn't have a built-in equality function for tables
-- We need to implement our own
local function tablesEqual(t1, t2)
    if #t1 ~= #t2 then return false end
    for i = 1, #t1 do
        if t1[i] ~= t2[i] then return false end
    end
    return true
end

local t2 = {"g", "h", "i"}
if tablesEqual(t, t2) then
    print("t == t2")
end

-- Multi-dimensional tables
local twoD = {}
for i = 1, 3 do
    twoD[i] = {}
    for j = 1, i do
        twoD[i][j] = i + j - 2
    end
end
print("2d:", twoD)