TLDR: Anyone have a working solution for inserting Vector3's into an array?

Hello friends, I'm trying to build a Vector3 array to store a bunch of locations. I started by simply using

var positions = Vector3[]

However, I soon learned that you can't use .Push or .Add with Vector3 for whatever reason. So I searched and found this solution: [http://answers.unity3d.com/questions/60191/arraypush-for-vector3-or-how-to-add-items-to-vecto.html][1]

So I tried using his first sample code:

import System.Collections.Generic;

var positions = List.();
function AddItem (var item : Vector3) {
     positions.Add(item);
}

However, Unity would give errors regarding an "Unexepected token" for the period on var positions = List.();. I tried to remove the period, and got this error: BCE0157: Generic types without all generic parameters defined cannot be instantiated. Thats about the limit of what I know about List, so I decided to try his next solution.

var positions : Vector3[];

function AddItem (var item : Vector3) : Vector3[] {
    var temp : Vector3[] = new Vector3[positions.Length + 1];
    temp[temp.Length - 1] = item;
    for(var i : int = 0; i < positions.Length; i++) {
         temp[i] = positions[i];
    }
}

There were no errors on this code, however for whatever reason, this doesn't actually insert data into the positions array! I checked that the item parameter is passing through successfully on AddItem(), and it is. So its just not being stored in the array for whatever reason.

If anyone has a working solution to this, would be much appreciated! Thanks [1]: http://answers.unity3d.com/questions/60191/arraypush-for-vector3-or-how-to-add-items-to-vecto.html125