Question

So, I was having this problem with arrays in JavaScript.
I initialized some variables as shown here:

var world = new Array;
var monsters = new Array;
var items = new Array;
var x = 0;
var y = 0;

and tried to run this code on it:

            while (y <= 49) { //generate world
                world[x][y] = parseInt(Math.floor(Math.random()*2)); //0 = flatland, 1 = desert, 2 = mountain, 3 = swamp
                x++;
                if (x >= 49) {
                    x = 0;
                    y++;
                }
            }
            x = 0;
            y = 0;

but I get presented with this error:
“TypeError: can’t convert undefined to object”
on the Math.random() line.
I’ve tried everything I can think of, but it still throws that error.
Any help will be greatly appreciated!

Answer 1

world[x][y] is not initialized. That’s the problem. You need to intialize below the while statement

while (y <= 49) {
    world[x] = new Array(); //add this