Helper function for a platform game to move an entity to a specific destination 

I needed to the ability for my enemy entity to move to a certain destination on the x axis based on a value from the server. I created a helper function to allow me to do this.

I two created functions on the ObjectEntity to achieve this.

setXDestination - set the destination x axis
walkToXDestination - It is useful to call this from the update function  in your entity
For example:
    update: function() {
        this.moveToXDestination();
        return true;
    }

Do you see any problems with this or improvements I should make?