Creating 2d array in gamemaker from code

Question

According to GameMaker2 arrays documentation, GML has 2d arrays. At the same time I could not find any references how can I create 2d array from code. I tried doing

board = array_create(global.MAX_HEIGHT);
for(var i = 0; i < global.MAX_HEIGHT; i++){
    board[i] = array_create(global.MAX_WIDTH);
}

but that seems to have created a 1d array of 1d arrays, meaning I cannot access them using board[x, y] (if I try it doesn't assign values properly) , or even board[x][y] (compilation error). Is there a way to dynamically create 2d array? Or to access this array more elegantly, instead of having to use

inside_array = board[i];
inside_array[j] = value;

Answer 1

The answer is- don't initialize the array, just access it. It will dynamically create 2d array. So to initialize 2d array to 0s, do

for(var i = 0; i < global.MAX_HEIGHT; i++){
  for(var j = 0; j < global.MAX_WIDTH; j ++){
    board[i, j] = 0;
  }
}

Answer 2

I prefer to use repeat instead of for, but you can enjoy the logic.

Basically you will use one loop inside another.

Code:

repeat(global.MAX_HEIGHT){
    i+=1;
    repeat(global.MAX_WIDTH){
        j+=1;
        board[i,j]=0;
    }
    j=0;
}

i=0;
j=0;

Then remember to reset the value of i and j.