example, for reference for the super tic-tac-toe game. shows how to fill a triple array with items and reference each one

triple_array_example.js

var count = 0;
var letters = ["a", "b", "c", "d", "e", "f", "g", "h", "i"]

var array = [[[], [], []],
             [[], [], []],
             [[], [], []]];

for (var i = 0; i < 3; i++) {
  for (var j = 0; j < 3; j++) {
    array[i][j] = letters[count];
    count++;
  }
}

console.log(array);
// console.log(array[0][1]);