function moveForward(roverDirection){
//Comprobamos hacia donde mira el Rover, y movemos en esa dirección
  switch(roverDirection){
    case 'N':
    if(checkObstacle([rover.x, rover.y])){
      rover.y--;
    }
    break;

    case 'W':
    if(checkObstacle([rover.x, rover.y])){
      rover.x--;
    }
    break;

    case 'S':
    if(checkObstacle([rover.x, rover.y])){
      rover.y++;
    }
    break;

    case 'E':
    if(checkObstacle([rover.x, rover.y])){
      rover.x++;
    }
    break;
  }
}

function checkObstacle([x, y]){
  var direction = rover.direction;

  if(direction === 'N'){
    if([x,y - 1] === 'obstacle'){
      console.log('Ups!');
      return false
    }else{
      return true;
    }
  }
  if(direction === 'W'){
    if([x - 1 ,y] === 'obstacle'){
      console.log('Ups!');
      return false
    }else{
      return true;
    }
  }
  if(direction === 'S'){
    if([x,y + 1] === 'obstacle'){
      console.log('Ups!');
      return false
    }else{
      return true;
    }
  }
  if(direction === 'E'){
    if([x + 1,y] === 'obstacle'){
      console.log('Ups!');
      return false
    }else{
      return true;
    }
  }
}

var grid = [
  ['rover', 'obstacle' , null , null, null, 'obstacle', null, null, null, null],
  [null, null , null , null, null, null, 'obstacle', null, null, null],
  [null, null , 'obstacle' , null, null, null, null, null, null, 'obstacle'],
  [null, null , null , null, null, null, null, null, null, null],
  ['obstacle', null , null , null, null, null, null, null, null, null],
  [null, null , null , null, null, null, null, null, null, null],
  [null, null , null , null, 'obstacle', null, null, null, null, null],
  [null, null , null , null, null, null, null, null, null, null],
  [null, null , null , null, null, null, null, null, null, 'obstacle'],
  [null, null , null , null, null, null, null, null, null, null],
];