hector-randomize-position.js

[
  [ 'A0', 'A1', 'A2', 'A3', 'A4', 'A5' ],
  [ 'B0', 'B1', 'B2', 'B3', 'B4', 'B5' ],
  [ 'C0', 'C1', 'C2', 'C3', 'C4', 'C5' ],
  [ 'D0', 'D1', 'D2', 'D3', 'D4', 'D5' ],
  [ 'E0', 'E1', 'E2', 'E3', 'E4', 'E5' ],
  [ 'F0', 'F1', 'F2', 'F3', 'F4', 'F5' ]
]

const rows = 'ABCDEF';
const arr = new Array(6).fill(0).map((_, i) => {
    return new Array(6).fill(0).map((_, j) => {
        return rows[i] + j;
    });
});

const random = () => Math.floor(Math.random() * 6);
const assigned = rows[random()] + random();

console.log(assigned);