function validCell (board, row, col) {
  if (row < 0 || row > 4 || col < 0 || col > 4) {
    return false;
  }
  if (board[row][col] !== 1) {
    return false;
  }
  return true;
}

function validMoves (board, row, col) {
  let moves = [];
  if (!validCell(board, row, col)) {
    return moves;
  }

  if (validCell(board, row+1, col)) {
    moves.push([row+1, col]);
  }
  if (validCell(board, row, col+1)) {
    moves.push([row,col+1]);
  }
  if (validCell(board, row-1, col)) {
    moves.push([row-1,col]);
  }
  if (validCell(board, row, col-1)) {
    moves.push([row, col-1]);
  }

  return moves;
}

let board = [
  [0, 1, 0, 0, 1],
  [1, 1, 0, 0, 0],
  [0, 0, 0, 0, 1],
  [1, 1, 0, 1, 1],
  [0, 1, 0, 0, 0]
];
let row = 4;
let column = 1;

console.log("Origin: (" + row + " , " + column + ")");
console.log(validMoves(board, row, column));