invoke repeating not working

i was trying invokeRepeating, but i couldn't get how it works.below is the script i used for learning invokeRepeating. the script is for enemy, where he has to shoot projectiles for every 1 second. need help.

 using UnityEngine;
 using System.Collections;
 
 public class cube_script : MonoBehaviour {
     
     public int speed = 5;
     public GameObject cubeProjectile;
     public float projectileOffset;
     Vector3 position;
     private float someValue = 0f;
     
     public Rigidbody projectile;
     
     // Update is called once per frame
     void Update () {
         
         //float amtToMove = speed * Time.fixedDeltaTime;
         //transform.Translate(Vector3.forward * amtToMove);
         
         //transform.rotation = Quaternion.Euler(new Vector3(0,0,100 * Time.time));
     }
     
     void instantiating()
     {
         Vector3 position = new Vector3(transform.position.x,transform.position.y, 
                                            transform.position.z + projectileOffset);        
         
         Instantiate(cubeProjectile, position, Quaternion.identity);
         Debug.Log(" instantiating ");
     }
     
     void example()
     {
         InvokeRepeating("instantiating", 0, 1F);
     }
 }