Script for Unity to implement Parallax effect for backgrounds on 2D games

Parallax.cs

//
//  Parallax.cs
//
//  Created by Rigoberto Sáenz Imbacuán (https://linkedin.com/in/rsaenzi/)
//  Copyright © 2021. All rights reserved.
//

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

[RequireComponent(typeof(SpriteRenderer))]

public class Parallax : MonoBehaviour {

    [Tooltip("Horizontal motion speed in meters/seconds")]
    public float motionSpeed;

    [Tooltip("Width of the camera's frustrum in meters")]
    public float screenSize;

    void Update() {

        // Moves the background to left
        transform.Translate(Vector3.left * motionSpeed * Time.deltaTime, Space.Self);

        // If background reaches the left limit, we move it right twice the size of it
        if (transform.position.x <= -screenSize) {
            transform.Translate(screenSize * 2, 0, 0, Space.World);
        }
    }
}