isWalkableAt method
Determine whether the node at the given position is walkable. (Also returns false if the position is outside the grid.) @param {number} x - The x coordinate of the node. @param {number} y - The y coordinate of the node. @return {boolean} - The walkability of the node.
Implementation
bool isWalkableAt(x, y) {
return this.isInside(x, y) && this.nodes[y][x].walkable;
}