MinesweeperGame.prototype.countMines = function() {
    return this._countCellsInDict(this._mines);
};
 
MinesweeperGame.prototype.countFlags = function() {
    return this._countCellsInDict(this._flags);
};
 
MinesweeperGame.prototype.countOpenCells = function() {
    return this._countCellsInDict(this._openCells);
};
 
MinesweeperGame.prototype.hasMine = function(x, y) {
    return this._isCellInDict(x, y, this._mines);
};
 
MinesweeperGame.prototype.hasOpened = function(x, y) {
    return this._isCellInDict(x, y, this._openCells);
};
 
MinesweeperGame.prototype.hasFlag = function(x, y) {
    return this._isCellInDict(x, y, this._flags);
};
 
MinesweeperGame.prototype._isCellInDict = function(x, y, dict) {
    if (dict[y]) {
        return dict[y][x];
    }
    return false;
};
 
MinesweeperGame.prototype._countCellsInDict = function(dict) {
    var counter = 0;
    for (var y in dict) {
        if (!dict.hasOwnProperty(y)) continue;
        for (var x in dict[y]) {
            if (!dict[y].hasOwnProperty(x)) continue;
            counter++;
        }
    }
    return counter;
 
};

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