How to make a projectile keep moving forward and then destroy itself when out of the map

Questions & Answers
1

So basically I wanted to make a game where you take control of a pirate on a boat that tries to avoid cannonballs shot at him.

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

public class Projectile : MonoBehaviour {    public float speed;

    private Transform player;
    private Vector2 target;

    void Start(){

        player = GameObject.FindGameObjectWithTag("Player").transform;

        target = new Vector2(player.position.x, player.position.y);

    }
    
    void Update(){



        transform.position = Vector2.MoveTowards(transform.position, target, speed * Time.deltaTime);

       
        
    }


    void OnTriggerEnter2D(Collider2D other){
        if(other.CompareTag("Player")){

            DestroyProjectile();
        }


    }
    void DestroyProjectile(){

        Destroy(gameObject);
    } }

I used this code to make projectiles go after the player but I’m not sure how do I make them keep moving forward after reaching their destination. I also want them to destroy themselves after going out of the map.

2

Vector3 motion;
void Start()
{
Vector3 sourceToDestination = player.position - transform.position;
motion = sourceToDestination.normalized * speed;
}

Ok I added another vector and replaced the void Update with this :

void Update()
 {
     transform.position += motion * Time.deltaTime;   
 }

It seems to go in a line after achieving it’s original destination but I still don’t know how to make it disappear after going out of the map.