JavaScript two-dimensional array example

gistfile1.js

var size = 3;

var grid = new Array(size);
for (var i = 0; i < size; i++) {
  grid[i] = new Array(size);
}

grid[0][0] = 'x';
grid[0][1] = 'o';
grid[0][2] = 'o';

grid[1][0] = 'o';
grid[1][1] = 'x';
grid[1][2] = 'o';

grid[2][0] = 'o';
grid[2][1] = 'o';
grid[2][2] = 'x';

var string = '';
for (var row = 0; row < size; row++) {
  for (var column = 0; column < size; column++) {
    string = string + grid[row][column];
  }
  string = string + "\n";
}
console.log(string);