EnemyPatrol.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EnemyPatrol : MonoBehaviour
{

    public float moveSpeed;
    public bool movingRight;

     public Transform wallCheck;
     public LayerMask whatIsWall;
    public float wallCheckRadius;

    private bool notAtEdge;

    public Transform edgeCheck;







    private bool hittingWall;
    // Start is called before the first frame update
    void Start()
    {

    }

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

        hittingWall = Physics2D.OverlapCircle(wallCheck.position, wallCheckRadius, whatIsWall);

        notAtEdge = Physics2D.OverlapCircle(edgeCheck.position, wallCheckRadius, whatIsWall);

        if (hittingWall || !notAtEdge)
        {
            movingRight = !movingRight;
        }

        if (movingRight)
        {
            transform.localScale = new Vector3(-1f, 1f, 1f);
            GetComponent<Rigidbody2D>().velocity = new Vector2(moveSpeed, GetComponent<Rigidbody2D>().velocity.y);
        }
        else
        {
            transform.localScale = new Vector3(1f, 1f, 1f);
            GetComponent<Rigidbody2D>().velocity = new Vector2(-moveSpeed, GetComponent<Rigidbody2D>().velocity.y);
        }

    }
}