Medium Blog Post - Data Hiding, Instances, and Better Testing with JS Factories and Closures

BoardSingleton.js

let board;
resetToEmptyBoard();

function getBoard() {
  return board;
}

function cellIsEmpty(position){
  const empty = board[position] === ' ';
  return empty;
}

function getEmptyCells(){
  const emptyCells = board.filter(cell => {
    return cell === ' '
  });
  return emptyCells;
}

function resetToEmptyBoard(){
  board = [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '];
}

function setBoard(newBoard){
  board = newBoard;
}

function isFull(board){
  const emptyCells = board.filter(cell => { 
    return cell === ' '
  });
  return emptyCells.length === 0;
}

const Board = {
  isFull,
  getBoard,
  getEmptyCells,
  cellIsEmpty,
  resetToEmptyBoard,
  setBoard
};

export default Board;