Codewars

MINESWEEPER (created by Cbr)

https://www.sololearn.com/post/149770/?ref=app

This challenge is based on the game Minesweeper.

Create a function that takes a list of # and -, where each hash (#) represents a mine and each dash (-) represents a mine-free spot. Return a list where each dash is replaced by a digit indicating the number of mines immediately adjacent to the spot (horizontally, vertically, and diagonally).

  
Examples
num_grid([
  ["-", "-", "-", "-", "-"],
  ["-", "-", "-", "-", "-"],
  ["-", "-", "#", "-", "-"],
  ["-", "-", "-", "-", "-"],
  ["-", "-", "-", "-", "-"]
]) ➞ [
  ["0", "0", "0", "0", "0"],
  ["0", "1", "1", "1", "0"],
  ["0", "1", "#", "1", "0"],
  ["0", "1", "1", "1", "0"],
  ["0", "0", "0", "0", "0"],
]

num_grid([
  ["-", "-", "-", "#", "#"],
  ["-", "#", "-", "-", "-"],
  ["-", "-", "#", "-", "-"],
  ["-", "#", "#", "-", "-"],
  ["-", "-", "-", "-", "-"]
]) ➞ [
  ["1", "1", "2", "#", "#"],
  ["1", "#", "3", "3", "2"],
  ["2", "4", "#", "2", "0"],
  ["1", "#", "#", "2", "0"],
  ["1", "2", "2", "1", "0"],
]

Minesweeper challenge