map_generate()

 function map_generate(tilemap, tilemapProperties)
    for i = 1, tilemapProperties.rows do
        tilemap[i] = {}
        for j = 1, tilemapProperties.columns do
            if i == 1 then
                if j == 1 then
                    tilemap[i][j] = 1
                elseif j == tilemapProperties.columns then
                    tilemap[i][j] = 3
                else
                    tilemap[i][j] = 2
                end
            elseif i == tilemapProperties.rows then
                if j == 1 then
                    tilemap[i][j] = 7
                elseif j == tilemapProperties.columns then
                    tilemap[i][j] = 5
                else
                    tilemap[i][j] = 6
                end
            else
                if j == 1 then
                    tilemap[i][j] = 8
                elseif j == tilemapProperties.columns then
                    tilemap[i][j] = 4
                else
                    tilemap[i][j] = 0
                end
            end
        end
    end
end