Functional Katas, Token! 20-11-2017

minesweeper.js

const rows = 4
const columns = 4

const field = [
  ['*', '.', '.', '.'],
  ['.', '.', '.', '.'],
  ['.', '*', '.', '.'],
  ['.', '.', '.', '.']
]

const calcHint = (field, m, n, i, j) => {
  if (field[i][j] === '*') {
    return '*'
  }
  let total = 0

  const startI = Math.max(0, i - 1)
  const stopI = Math.min(m - 1, i + 1)
  const startJ = Math.max(0, j - 1)
  const stopJ = Math.min(n - 1, j + 1)

  for (let ii = startI; ii <= stopI; ii++) {
    for (let jj = startJ; jj <= stopJ; jj++) {
      if (!(i === ii && j === jj) && field[ii][jj] === '*') {
        total++
      }
    }
  }
  return total
}

const hintField = []

for (let i = 0; i < rows; i++) {
  hintField.push([])
  for (let j = 0; j < columns; j++) {
    hintField[i].push(calcHint(field, rows, columns, i, j))
  }
}

console.log(hintField)