text: import { NotImplementedError } from '../extensions/index.js';
  
  /**
   * In the popular Minesweeper game you have a board with some mines and those cells
   * that don't contain a mine have a number in it that indicates the total number of mines
   * in the neighboring cells. Starting off with some arrangement of mines
   * we want to create a Minesweeper game setup.
   *
   * @param {Array<Array>} matrix
   * @return {Array<Array>}
   *
   * @example
   * matrix = [
   *  [true, false, false],
   *  [false, true, false],
   *  [false, false, false]
   * ]
   *
   * The result should be following:
   * [
   *  [1, 2, 1],
   *  [2, 1, 1],
   *  [1, 1, 1]
   * ]
   */
  export default function minesweeper ( matrix ) {
  
    let result = matrix.map(element => {
      return element.map(item => {
        if (item == true) {
          return +1;
        } else {
          return 0;
        }
      })
    })
  
    for (let i = 0; i < matrix.length; i++) {
      for (let j = 0; j < matrix[i].length; j++) {
        if (matrix[i][j] == 1) {
          if (matrix[i - 1] && matrix[i - 1][j] <= 0) result[i-1][j] += 1;
          if (matrix[i - 1] && matrix[i - 1][j + 1] <= 0) result[i - 1][j + 1] += 1;
          if (matrix[j + 1] && matrix[i][j + 1] <= 0) result[i][j + 1] += 1;
          if (matrix[i + 1] && matrix[i + 1][j + 1] <= 0) result[i + 1][j + 1] += 1;
          if (matrix[i + 1] && matrix[i + 1][j] <= 0) result[i + 1][j] += 1;
          if (matrix[i + 1]&& matrix[i + 1][j - 1] <= 0) result[i + 1][j - 1] += 1;
          if (matrix[i][j - 1] <= 0) result[i][j - 1] += 1;
          if (matrix[i - 1] && matrix[i - 1][j - 1] <= 0) result[i - 1][j - 1] += 1;
        }
      }
    }
    return result;
  }
  