CoffeeScript from irb.no 26th january

minefield.coffee

class exports.Minefield

  constructor: (@cells)->

  hints: ->
    ((@hint(row,col) for col in @cols()).join("") for row in @rows())
  
  rows: -> [0...@cells.length]
  cols: -> [0...@cells[0].length]
  hint: (row,col) ->
    return "*" if @hasMine(row,col)
    count = 0
    for r in [row-1..row+1]
      for c in [col-1..col+1]
        count++ if @hasMine(r,c)
    count

  hasMine: (row,col) ->
    return false unless 0 <= row < @cells.length
    return false unless 0 <= col < @cells[0].length
    @cells[row][col] == '*'