Simple tic tac toe logic

tic_tac_toe.js

var winningBoards = [
  genWinningColBoard(0),
  genWinningColBoard(1),
  genWinningColBoard(2),
  genWinningRowBoard(0),
  genWinningRowBoard(1),
  genWinningRowBoard(2),
  getDiagonalBoard(3),
  getDiagonalBoard(3, true)
];

function getDiagonalBoard(size, invert){
  var board = [];
  var holder;
  var test = invert ? invertTest : regTest;

  if(size % 2 === 0){
    throw new Error("Boards size must be a odd number")
  }

  for(var row = 0;row<size;row++){
    holder = [];
    for(var col = 0;col<size;col++){
      var val = test(row,col, size) ? 1 : 0;
      holder.push(val);
    }
    board.push(holder.slice())
  }

  return board

  function regTest(row,col,size){
    return row === col
  }

  function invertTest(row,col,size){
    return col === size - row- 1;
  }
}

function genWinningRowBoard(rowIdx){
  return [0,1,2].map(function(idx){
    var val = idx == rowIdx ? 1 : 0;
    return [val, val, val]
  });
}

function genWinningColBoard(colIdx){
  return [0,1,2].map(function(idx){
    var row = [0, 0, 0]
    row[colIdx] = 1;
    return row
  }); 
}

function checkBoard(input, val){
  var converted = input.map(function(row){
    return row.map(function(pos){
      return pos === val ? 1 : 0
    })
  })

  return winningBoards.map(function(board){
    return board.map(function(row, rowIdx){
      return row.map(function(pos, posIdx){
        return pos === 0 || (pos === 1 && converted[rowIdx][posIdx] === 1);
      })
    })
  }).filter(function(checked){
    return checked.toString() === 'true,true,true,true,true,true,true,true,true'
  })
}

checkBoard([
  [1, 0, null],
  [1, 0, 0],
  [1, null, 1]
], 1)