LÖVE

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local map = {
    {0,1,0,1,0},
    {0,1,0,1,0},
    {0,1,1,1,0},
    {0,0,0,0,0},
}

for i,_ in ipairs(map) do
	for j, _ in ipairs(map) do
		io.write(map[i][j] .. " ")
	end
	io.write('\n')
end
io.write('\n')

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0 1 0 1
0 1 0 1
0 1 1 1
0 0 0 0

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	local objMap = {}

	for y = 1,10 do
		objMap[y] = {}
	end
	
	-- instantiate the map with default values
	for y = 1,10 do
		for x = 1,8 do
			print("Instantiating " .. x .. "," .. y)
			objMap[x][y] = {}
		end
	end	

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Instantiating 1,1
Instantiating 2,1
Instantiating 3,1
[snip]
Instantiating 7,1
Instantiating 8,1
Instantiating 1,2
Instantiating 2,2
[snip]
Instantiating 6,10
Instantiating 7,10
Instantiating 8,10

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	print("Max y = " .. table.maxn(objMap) .. " max x = " .. table.maxn(objMap[1]))

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Max y = 10 max x = 10

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for i, line in ipairs(map) do
	for j, value in ipairs(line) do
		io.write(value .. " ")
	end
	io.write('\n')
end

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for i = 1, #map do --#map is 4
	local line = map[i]
	for j = 1, #line do -- #line is 5
		local value = map[i][j]
		io.write(value .. " ")
	end
	io.write('\n')
end

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local map = {}
for y = 1, 8 do -- remember, lines!
  map[y] = {}
  for x = 1, 10 do
    print("Instantiating " .. x .. "," .. y)
    map[y][x] = {} -- lines are first!
  end
end

Code: Select all

local map = {}
for y = 1, 8 do
  for x = 1, 10 do
    map[x] = map[x] or {} -- if no map[x], then create the empty one
    print("Instantiating " .. x .. "," .. y)
    map[x][y] = {}
  end
end