--!native
numbers = {}
dictionary = {}

for i=1,1e7 do
    numbers[#numbers+1] = true
    dictionary[tostring(i)] = true
end

local iterator = function(tbl, index)
    local nextIndex = index + 1
    local v = tbl[nextIndex]
    if v ~= nil then
        return nextIndex, v
    end
end

local numbers = setmetatable(numbers, {
    __iter = function(tbl)
        return iterator, tbl, 0
    end,
})

local dictionary = setmetatable(numbers, {
    __iter = function(tbl)
        return next, tbl, nil
    end,
})

task.wait()

--ipairs numbers
local t = os.clock()
local value = true
for i,v in ipairs(numbers) do
    value = value and v --you need to do something otherwise it won't be a meaningful test
end
local dt_ipairs_list = os.clock() - t

task.wait()

--pairs numbers
local t = os.clock()
local value = true
for i,v in pairs(numbers) do
    value = value and v --you need to do something otherwise it won't be a meaningful test
end
local dt_pairs_list = os.clock() - t

task.wait()

--pairs dictionary
local t = os.clock()
local value = true
for i,v in pairs(dictionary) do
    value = value and v --you need to do something otherwise it won't be a meaningful test
end
local dt_pairs_dict = os.clock() - t

task.wait()

--no pairs numbers
local t = os.clock()
local value = true
for i,v in numbers do
    value = value and v --you need to do something otherwise it won't be a meaningful test
end
local dt_nopairs_list = os.clock() - t

task.wait()

--no pairs dictionary
local t = os.clock()
local value = true
for i,v in dictionary do
    value = value and v --you need to do something otherwise it won't be a meaningful test
end
local dt_nopairs_dict = os.clock() - t

task.wait()

print("ipairs list: "..dt_ipairs_list)
print("pairs list: "..dt_pairs_list)
print("pairs dict: "..dt_pairs_dict)
print("nopairs list: "..dt_nopairs_list)
print("nopairs dict: "..dt_nopairs_dict)