Putting it all together

With all of the stuff we've been talking about, we can now have the final version of the script, which looks like the following:

using UnityEngine; 
  
/// <summary> 
/// Responsible for moving the player automatically and  
/// reciving input. 
/// </summary> 
[RequireComponent(typeof(Rigidbody))] 

public class PlayerBehaviour : MonoBehaviour 
{ 
    /// <summary> 
    /// A reference to the Rigidbody component 
    /// </summary> 
    private Rigidbody rb; 
 
    [Tooltip("How fast the ball moves left/right")] 
    public float dodgeSpeed = 5; 
 
     
    [Tooltip("How fast the ball moves forwards automatically")] 
    [Range(0, 10)] 
    public float rollSpeed = 5; 
 
    /// <summary> 
    /// Use this for initialization 
    /// </summary> 
    void Start () 
   { 
        // Get access to our Rigidbody component 
       rb = GetComponent<Rigidbody>(); 
   } 
 
    /// <summary> 
    /// Update is called once per frame 
    /// </summary> 
    void Update () 
   { 
        // Check if we're moving to the side 
       var horizontalSpeed = Input.GetAxis("Horizontal") *  
                              dodgeSpeed; 
 
        // Apply our auto-moving and movement forces 
      rb.AddForce(horizontalSpeed, 0, rollSpeed); 
   } 
} 

I hope that you also agree that this makes the code easier to understand and better to work with.