how to add a restart button in unity code example

Example: how to make a restart button in unity 2d

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
public class ReloadButten : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update() {

       if (Input.GetKeyDown(KeyCode.R))
        {
            SceneManager.LoadScene(SceneManager.GetActiveScene().name);
        }
   }
}