Solution to https://edabit.com/challenge/voZCqTGMSNjCrRhf9

Minesweeper.js

/*
Solution to https://edabit.com/challenge/voZCqTGMSNjCrRhf9
Minesweeper I — Grid
This challenge is based on the game Minesweeper.
Create a function that takes a grid of # and -, where each hash (#) represents a mine and each dash (-) represents a mine-free spot. Return an array where each dash is replaced by a digit indicating the number of mines immediately adjacent to the spot (horizontally, vertically, and diagonally).
Examples
numGrid([
  ["-", "-", "-", "-", "-"],
  ["-", "-", "-", "-", "-"],
  ["-", "-", "#", "-", "-"],
  ["-", "-", "-", "-", "-"],
  ["-", "-", "-", "-", "-"]
]) ➞ [
  ["0", "0", "0", "0", "0"],
  ["0", "1", "1", "1", "0"],
  ["0", "1", "#", "1", "0"],
  ["0", "1", "1", "1", "0"],
  ["0", "0", "0", "0", "0"],
]
numGrid([
  ["-", "-", "-", "-", "#"],
  ["-", "-", "-", "-", "-"],
  ["-", "-", "#", "-", "-"],
  ["-", "-", "-", "-", "-"],
  ["#", "-", "-", "-", "-"]
]) ➞ [
  ["0", "0", "0", "1", "#"],
  ["0", "1", "1", "2", "1"],
  ["0", "1", "#", "1", "0"],
  ["1", "2", "1", "1", "0"],
  ["#", "1", "0", "0", "0"]
]
numGrid([
  ["-", "-", "-", "#", "#"],
  ["-", "#", "-", "-", "-"],
  ["-", "-", "#", "-", "-"],
  ["-", "#", "#", "-", "-"],
  ["-", "-", "-", "-", "-"]
]) ➞ [
  ["1", "1", "2", "#", "#"],
  ["1", "#", "3", "3", "2"],
  ["2", "4", "#", "2", "0"],
  ["1", "#", "#", "2", "0"],
  ["1", "2", "2", "1", "0"],
]
*/

const mineBoards = [
    [
        ["-", "-", "-", "-", "-"],
        ["-", "-", "-", "-", "-"],
        ["-", "-", "#", "-", "-"],
        ["-", "-", "-", "-", "-"],
        ["-", "-", "-", "-", "-"],
    ],
    [
        ["-", "-", "-", "-", "#"],
        ["-", "-", "-", "-", "-"],
        ["-", "-", "#", "-", "-"],
        ["-", "-", "-", "-", "-"],
        ["#", "-", "-", "-", "-"],
    ],
    [
        ["-", "-", "-", "#", "#"],
        ["-", "#", "-", "-", "-"],
        ["-", "-", "#", "-", "-"],
        ["-", "#", "#", "-", "-"],
        ["-", "-", "-", "-", "-"],
    ],
];

function newBoards() {
    const newBoards = [];
    for (let boardIndex = 0; boardIndex < mineBoards.length; boardIndex++) {
        const board = mineBoards[boardIndex]
        const newBoard = [];

        for (let lineIndex = 0; lineIndex < board.length; lineIndex++) {
            let line = board[lineIndex];
            const newLine = [];
            for (let cellIndex = 0; cellIndex < line.length; cellIndex++) {
                let cell = line[cellIndex]
                if (cell === '-') {
                    cell = 0 //start counting the '#'

                    // right/left
                    const elementOnTheRightPosition = cellIndex + 1;

                    const elementOnTheLeftPosition = cellIndex - 1;

                    //top/down
                    const lineAbove = board[lineIndex - 1]
                    const lineBelow = board[lineIndex + 1]

                    // has mine to the right
                    if(line[elementOnTheRightPosition] === '#'){
                        cell++
                    }

                    // has mine to the down-right
                    if(lineBelow?.[elementOnTheRightPosition] === '#'){
                        cell++
                    }

                    // has mine to the down
                    if (lineBelow?.[cellIndex] === '#') {
                        cell++
                    }

                    // has mine to the down left
                    if(lineBelow?.[elementOnTheLeftPosition] === '#'){
                        cell++
                    }

                    // has mine to the left
                    if(line[elementOnTheLeftPosition] === '#'){
                        cell++
                    }

                    // has mine top left
                    if(lineAbove?.[elementOnTheLeftPosition] === '#'){
                        cell++
                    }

                    // has mine top
                    if(lineAbove?.[cellIndex] === '#'){
                        cell++
                    }

                    // has mine top right
                    if(lineAbove?.[elementOnTheRightPosition] === '#'){
                        cell++
                    }

                }
                newLine.push(cell +'')
                // ^ put a string so '#' and '0' (not 0) are evenly formatted in columns
                //   [ '1', '1', '2', '#', '#' ],
                //   [ '1', '#', '3', '3', '2' ],
                // vs
                //   [ 1, 1, 2, '#', '#' ],
                //   [ 1, '#', 3, 3, 2 ],

            }
            newBoard.push(newLine);
        }
        newBoards.push(newBoard);
    }

    console.log(newBoards)
}

newBoards()