demineur.js

const ROWS = 10
const COLS = 10
const N = 20

const TABLE = [
  ':zero:', ':one:', ':two:', ':three:', ':four:',
  ':five:', ':six:', ':seven:', ':eight:',
]
const BOMB = ':bomb:'

const board = Array(ROWS * COLS).fill(0)

function incBoard(x, y) {
  if (x < 0 || x >= ROWS || y < 0 || y >= COLS || board[y * ROWS + x] == -1)
    return
  board[y * ROWS + x]++
}

for (let i = 0; i < N;) {
  const x = Math.floor(Math.random() * ROWS)
  const y = Math.floor(Math.random() * COLS)
  const index = y * ROWS + x

  if (board[index] == -1)
    continue;

  incBoard(x - 1, y - 1)
  incBoard(x    , y - 1)
  incBoard(x + 1, y - 1)
  incBoard(x - 1, y    )
  board[index] = -1
  incBoard(x + 1, y    )
  incBoard(x - 1, y + 1)
  incBoard(x    , y + 1)
  incBoard(x + 1, y + 1)

  i++;
}

let display = ''
for (let y = 0; y < COLS; y++) {
  for (let x = 0; x < ROWS; x++) {
    let val = board[y * ROWS + x]
    let n = val != -1 ? TABLE[val] : BOMB

    display += `||${n}||`
  }

  display += '\n'
}
console.log(display)