How do I make it so that this scripts adds to a list without overfilling it.

Questions & Answers
1

How do I make it so I add things to a List every frame but the objects that are added refresh it with out going above the desired point?

EX: This is the script that I want to fix:

public WaterPuddleTeleport WTP;

public GameObject Player;

public float DistanceToPlayer;

// Start is called before the first frame update
void Start()
{
    Player = GameObject.FindGameObjectWithTag("Player");
}

// Update is called once per frame
void Update()
{
    WTP = GameObject.FindObjectOfType<WaterPuddleTeleport>();
    WTP.PuddleDistance.Add(this.gameObject.GetComponent<PuddleScript>().DistanceToPlayer);
    DistanceToPlayer = Vector3.Distance(this.transform.position, Player.transform.position);
}

I want to make it so that it refreshes the spot it had in the list.

2

You could get the index of the element which will be updated, remove the element from the list and use list.Insert(index) to add the updated element at the same position.

3

Unless you are creating and destroying Puddles all the time, you could build a List in Start() of all the Puddles. Find operations are time expensive.
Then in Update, iterate through it with a foreach loop and check the distance to your Player for each one.
Also, I think Magnitude() is more efficient that Distance() as a vector calculation.

Additional: Thinking a bit about it, the “Unity way” is to put a Collider around each Puddle and use the collider mechanics.