Traversing a game board using moves

Question

I am having trouble figuring out a solution to traversing an array list that's treated as a board with walls and directions given. Basically you are given an array list like so:

  xxxxxxx
  x-g--xx
  x---xxx
  x-----x
  x--x--x
  x---1-x
  xxxxxxx

With a given list of moves:

uluudrll 

The goal is to use the list of moves and make the according move based on the letter (u for up, d for down, etc.) given while you are traversing this board. You treat the x's as walls and g is your goal. The player is 1. I am using javascript for the code.

     if(move === 'd'){
        if(maze[row + 1][col] !== 'x'){
            maze[row + 1][col] = player;
            maze[row][col] = '-';
            count++;
        } else {
            if(move === 'd'){
                if(maze[row - 1][col] !== 'x'){
                    maze[row - 1][col] = player;
                    maze[row][col] = '-';
                    count++;
                } else if(maze[row][col + 1] !== 'x'){
                    maze[row][col + 1] = player;
                    maze[row][col] = '-';
                    count++;
                } else if(maze[row][col - 1] !== 'x'){
                    maze[row][col - 1] = player;
                    maze[row][col] = '-';
                    count++;
                }
            }
        }
    }

This is my code for moving down and accommodating for the other movements (for example, if we read in a down movement, d, and it can't move because of a wall, the player will move to the other positions. I don't know whats going on with my code, but when I try to move in any other directions it won't work. Please help I'm pretty confused as to why game isn't working.

Answer 1

Here is a pseudo code example on how to approach your game using Javascript

Take for example this array as your board:

arrayBoard = [["x","x","x","x"],["x","-","-","x"],["x","-","1","x"],["x","x","x","x"]];

If you want to move the player up for example first you need the player position indexOf("1"); in this case is arrayBoard[2][2];

Then you know that up is the same position but on the second nested array arrayBoard[[1][2]; and so on for the other directions.

To move the player you will have to replace the target postion with "1" and the previous position with "-".

Now you will build your function movement(){} based on conditions like if index of "1" + 1 !=="x" && === "g" then finish game

So if you write your sequence as an array seq = ["u","u","d","l","u"]; you will have to iterate over it and call your function movement(){} on each element.

By the way indexOf() in a multidimensional array will need .map or a loop to work.