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HTML

              
                <div class = "game">
  <span>Tic Tac Toe</span>
  <div class = "row">
    <div data-i=0 data-j=0 class = "col"></div>
    <div data-i=0 data-j=1 class = "col"></div>
    <div data-i=0 data-j=2 class = "col"></div>
  </div>
  <div class = "row">
    <div data-i=1 data-j=0 class = "col"></div>
    <div data-i=1 data-j=1 class = "col"></div>
    <div data-i=1 data-j=2 class = "col"></div>
  </div>
  <div class = "row">
    <div data-i=2 data-j=0 class = "col"></div>
    <div data-i=2 data-j=1 class = "col"></div>
    <div data-i=2 data-j=2 class = "col"></div>
  </div>
  <button id = "choose" class = "O">O</button>
  <button id = "restart">Choose</button>
  <button id = "choose" class = "X">X</button>
</div>
<div class="footer">
  by <a id = "me" href="https://codepen.io/MukeshAngrish" title="See my other projects"> Mukesh K. Angrish</a>
</div>
              
            
!

CSS

              
                body{
  background : #17191F;
  text-align : center;
}
.game{
  background : #FF6767;
  width : 320px;
  margin : 5% auto auto auto;
}
span{
  font-size : 3em;
  color : white;
}
.col{
  font-size : 80px;
  vertical-align: middle;
  display : inline-block;
  border : none;
  background : white;
  margin-top : 1px;
  margin-bottom : 3px;
  width : 100px;
  height : 100px;
}
#restart{
  width : 100px;
  font-size : 30px;
  height : 100px;
  margin : 10px;
  border-radius : 50%;
  padding : 0px;
  color : #FF6767;
  border : none;
  background : white;
}
#choose{
  border : none;
  font-size : 3em;
  height : 50px;
  width : 50px;
  background : none;
  color : white;
}
.hide{
  display : none;
}
.footer{
  position: relative;
  color: white;
  width: 300px;
  margin: 10px auto 10px auto;
  font-size: 30px;
}
#me{
  text-decoration: none;
  color: white;
  font-size: 1.1em;
}
              
            
!

JS

              
                // default tokens
var playerToken = 'X';
var aiToken = 'O';
var winner = '';
$(document).ready(function() {
  // start win an empty grid
  var grid = [
    ['', '', ''],
    ['', '', ''],
    ['', '', ''],
  ];

  // hides X and O once selected and changes the restart button
  function hide() {
    $('.O, .X').addClass('hide');
    $('#restart').html('Restart');
  }

  // opposite of hide()
  function unhide() {
    $('.O, .X').removeClass('hide');
    $('#restart').html('Choose');
  }

  // checks if the game is over
  function isGameOver(grid) {
    // check win - horizontal and vertical
    for (var i = 0; i < 3; i++) {
      if (grid[i][0] != '' &&
         grid[i][0] == grid[i][1] &&
         grid[i][0] == grid[i][2])
        return grid[i][0];
      if (grid[0][i] != '' &&
         grid[0][i] == grid[1][i] &&
         grid[0][i] == grid[2][i])
        return grid[0][i];
    }

    // check win - diagonal top-left to bottom-right and bottom-left to top-right
    if ((grid[1][1] != '' &&
        grid[1][1] == grid[0][0] &&
        grid[1][1] == grid[2][2]) ||
       (grid[1][1] != '' &&
        grid[1][1] == grid[2][0] &&
        grid[1][1] == grid[0][2]))
      return grid[1][1];

    // if no one won, check for an empty space
    for (i = 0; i < 3; i++) {
      for (var j = 0; j < 3; j++) {
        if (grid[i][j] == '')
          return false;
      }
    }

    // if a tie happens
    return null;
  }

  function displayWinner(gameState) {
    if (gameState == playerToken)
      winner = 'Player Won';
    else if (gameState == aiToken)
      winner = 'AI Won';
    else
      winner = 'TIE';
    alert('Game Over : ' + winner);
    unhide();
    setTimeout(function () {
      for (var i = 0; i < 3; i++) {
        for (var j = 0; j < 3; j++) {
          grid[i][j] = '';
          $('.col[data-i=' + i + '][data-j=' + j + ']').html('');
        }
      }
      playerToken = 'X';
      aiToken = 'O';
    }, 300); 
  }

  function minmax(newGrid, depth, player) {
    var gameState = isGameOver(newGrid);
    if (gameState == false) { // if there is empty space
      var values = [];
      for (var i = 0; i < 3; i++) {
        for (var j = 0; j < 3; j++) {
          var gridCopy = _.cloneDeep(newGrid);
          if (gridCopy[i][j] !== '') continue;
          gridCopy[i][j] = player;
          var value = minmax(gridCopy, depth + 1,
            ((player === playerToken) ? aiToken : playerToken));
          values.push({
            cost: value,
            cell: {
              i: i,
              j: j,
            },
          });
        }
      }

      if (player == aiToken) {
        // get the max
        var max = _.maxBy(values, (v) => {
          return v.cost;
        });
        if (depth == 0) {
          return max.cell;
        } else {
          return max.cost;
        }
      } else {
        var min = _.minBy(values, (v) => {
          return v.cost;
        });
        if (depth == 0) {
          return min.cell;
        } else {
          return min.cost;
        }
      }
    } else if (gameState == null) {
      return 0;
    } else if (gameState == playerToken) {
      return depth - 10;
    } else if (gameState == aiToken) {
      return 10 - depth;
    }
  }

  function moveAI() {
    return minmax(grid, 0, aiToken);
  }

  $('.O').on('click', function () {
    playerToken = 'O';
    aiToken = 'X';
    hide();
    
    setTimeout(function() {
      //update grid with ai move
      grid[0][0] = aiToken;
      $('.col[data-i=0][data-j=0]').html(aiToken);
    }, 300);
    var gameState = isGameOver(grid);
    if (gameState || gameState == null) {
      displayWinner(gameState);
    }
  });

  $('.X').on('click', function () {
    playerToken = 'X';
    aiToken = 'O';
    hide();
  });

  $('#restart').on('click', function () {
    unhide();
    for (var i = 0; i < 3; i++) {
      for (var j = 0; j < 3; j++) {
        grid[i][j] = '';
        $('.col[data-i=' + i + '][data-j=' + j + ']').html('');
      }
    }
    playerToken = 'X';
    aiToken = 'O';
  });

  $('.col').on('click', function () {
    hide();

    //get the column and row no. at which user placed the token
    var i = $(this).data('i');
    var j = $(this).data('j');
    if (grid[i][j] == '') {
      //upgrade the grid
      grid[i][j] = playerToken;
      $(this).html(playerToken);

      //check if someone won the game
      var gameState = isGameOver(grid);
      if (gameState || gameState == null) {
        displayWinner(gameState);
      } else {
        var move = moveAI();
        
        
        setTimeout(function() {
          //update grid with ai move
          grid[move.i][move.j] = aiToken;
          $('.col[data-i=' + move.i + '][data-j=' + move.j + ']').html(aiToken);
        }, 300);

        //check if someone won the game
        gameState = isGameOver(grid);
        if (gameState || gameState == null) {
          displayWinner(gameState);
        }
      }
    }
  });
});

              
            
!
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