breadth-first traversal of grid is working!

an array of token groups is calculated successfully
and it's probably fast enough.

grid.gd

@@ -21,10 +21,14 @@ func _ready():
 			var token_node = token.instantiate()
 			add_child(token_node)
 			token_node.position = Vector2(offset*column, offset*row)
+			token_node.set_type(randi_range(0,3 ))
 			token_node.set_debug_label(str(row) + "," + str(column))
 			grid[row].append(token_node)
 			
-	calculate_token_groups()
+	
+func _process(_delta: float) -> void:
+	if Input.is_action_just_pressed("activate"):
+		calculate_token_groups()
 			
 func populate_grid():
 	pass
@@ -54,14 +58,20 @@ func calculate_token_groups():
 				visited_nodes.append(current_coord)
 			
 				var adjacent_token_coords = [
-					[row - 1, col],
-					[row, col + 1],
-					[row + 1, col],
-					[row, col - 1]
+					[current_coord[0] - 1, current_coord[1]],
+					[current_coord[0], current_coord[1] + 1],
+					[current_coord[0] + 1, current_coord[1]],
+					[current_coord[0], current_coord[1] - 1]
 				]
 			
 				var valid_coords = adjacent_token_coords.filter(
-					func(coord_pair): return coord_pair[0] >= 0 and coord_pair[0] < rows and coord_pair[1] >= 0 and coord_pair[1] < cols
+					func(coord_pair): 
+						return (
+							coord_pair[0] >= 0 and 
+							coord_pair[0] < rows and 
+							coord_pair[1] >= 0 and 
+							coord_pair[1] < cols
+						)
 				)
 			
 				for coord in valid_coords: