2D array causing crashes when accessing arrays within array

Help
#1

I’m making a physics based game that breaks down it’s walls into smaller chunks so only the nearest walls are checked for collision, and add them into a 2D array on the fly. I’ve had this working under actionscript 2 and 3 for a long time, so I know how to get it over to haxe/openFL. However, at the point where I need it to check if an array has already been made within the main array, it crashes on startup. The code I have below is how it should look.

public static var grid:Array<Dynamic>; //Have tried it as grid:Array<Array<Object>>;, no success

function register(wall:Floor, x:Int, y:Int)
        {
			var obj:Object = new Object();
			obj.storage2 = new Array();
			if (grid[x] == null) {
				grid[x] = new Array(); //trace shows this array is being made without a problem
			}
			if (grid[x][y] == null) //this line is where the crash occurs
			{
				grid[x][y] = obj;
			}
			grid[x][y].storage2[wall.count] = wall;
			return;
        }

Output:

Build succeeded
Done(0)
haxelib run lime run “project.xml” windows -release
Running process: C:\HaxeToolkit\haxe\haxelib.exe run lime run “project.xml” windows -release
Done(1)

Help is much appreciated, thank you.

#2

I like to use Reflect.field to get values and Reflect.setField to set them. I’ve had problems in the past trying to get and set Dynamic types on targets other then Flash.

#3

Array<Dynamic> definitely won’t work. At the very least it should be Array<Array<Dynamic>>.

For sparse arrays, use Map rather than Array:

public static var grid:Map<Int, Map<Int, Dynamic>>;

function register(wall:Floor, x:Int, y:Int)
        {
			var obj:Object = new Object();
			obj.storage2 = new Array();
			if (grid[x] == null) {
				grid[x] = new Map();
			}
			if (grid[x][y] == null)
			{
				grid[x][y] = obj;
			}
			grid[x][y].storage2[wall.count] = wall;
        }