Recursive & iterative map functions

map.lua

arr = {}

function table_range(t, min, max)
	for i = min, max do
		table.insert(t, i, i)
		i = i + 1
	end
end
table_range(arr, 1, 1000000)

-- A map function using iteration
function map(fun, arr)
	--index = index or 1
	if  (fun == nil and arr[1] == nil) then return nil end
	local max = table.maxn(arr)
	for i = 1, max do
		fun(arr[i])
	end
end

-- A map function using recursion
function rmap(fun, arr, index)
	local index = index or 1
	fun(arr[index])
	if  (fun ~= nil and arr[1] ~= nil and index ~= table.maxn(arr)) then
		rmap(fun, arr, index + 1)
	end
end