// a "random" 2-D array
var a = [[2, 12, 10, 4], [18, 11, 9, 3], [14, 15, 7, 17], [6, 19, 8, 13], [1, 20, 16, 5]];

outer_loop:
for (var i in a) {
    print("row " + i);
    for (var j in a[i]) {
        print(" " + a[i][j]);
        if (a[i][j] == 20)
            break outer_loop;
    }
}
print("done");