this.i = i;

  this.j = j;

  this.walls = [true, true, true, true]

  this.visited = false;

  this.neighbors = [undefined,undefined,undefined,undefined];

  this.f = 0;

  this.g = 0;

  this.h = 0;

  this.previous = undefined;

  this.checkNeighborsMaze = function(grid) {

    var neighbors = [];

    var top;

    var right;

    var bottom;

    var left;

    if(j>0){

      top = grid[i][j-1];

    }

    if(i<cols - 1){

      right = grid[i+1][j];

    }

    if(i<rows - 1){

      bottom = grid[i][j+1];

    }

    if(i>0){

      left = grid[i-1][j];

    }

    if(top && !top.visited){

      neighbors.push(top);

    }

    if(right && !right.visited){

      neighbors.push(right);

    }

    if(bottom && !bottom.visited){

      neighbors.push(bottom);

    }

    if(left && !left.visited){

      neighbors.push(left);

    }

    if(neighbors.length > 0){

      var r = floor(random(0,neighbors.length));

      return neighbors[r]

    }else{

      return undefined;

    }

  }

  this.addNeighbor = function(n){

    if(this.neighbors[0]){

      this.neighbors[1] = n;

    } else if(this.neighbors[1]){

      this.neighbors[2] = n;

    } else if(this.neighbors[2]){

      this.neighbors[3] = n;

    } else{

      this.neighbors[0] = n;

    }

  }

  this.highlight = function(c) { 

    var x = this.i * scl;

    var y = this.j * scl;

    noStroke();

    fill(c);

    rect(x,y,scl,scl)

  }

  this.show = function(c){

    var x = this.i * scl;

    var y = this.j * scl;

    stroke(255);

    fill(c);

    //top

    if(this.walls[0]){

      line(x,y,x+scl,y);

    }

    //right

    if(this.walls[1]){

      line(x+scl,y,x+scl,y+scl);

    }

    //bottom

    if(this.walls[2]){

      line(x+scl,y+scl,x,y+scl);

    }

    //left

    if(this.walls[3]){

      line(x,y+scl,x,y);

    }

    if(this.visited){

      noStroke();

      fill(255,0,255,90);

      rect(x,y,scl,scl)

    }

  }

}

​

​