gistfile1.txt

function Point(x, y) {
  this.x = x;
  this.y = y;
}

Point.prototype = {
  west: function() {
    return new this(this.x-1, this.y);
  },
  east: function() {
    return new this(this.x+1, this.y);
  },
  north: function() {
    return new this(this.x, this.y-1);
  },
  south: function() {
    return new this(this.x, this.y+1);
  },
  moveWest: function() {
    this.x--;
  },
  moveEast: function() {
    this.x++;
  },
  moveNorth: function() {
    this.y--;
  },
  moveSouth: function() {
    this.y++;
  }
};