Arrays in a class

Unity Engine
1

Somehow this doesn’t work and can’t find a solution. (Unityscript)

#pragma strict

class Container {
    public var theItems = new Array();
}

private var myCont : Container[];

function Awake () {
    myCont = new Container[1];
   
    var someObject : GameObject = new GameObject("some");
   
    myCont[0].theItems.Add(someObject);
}

The last line gives an error (NullReferenceException).

2

You’ve declared myCont with a size of 1 which means it fills it with null items. You need to create a new Container instance, populate it, and add that to your array as well.

3

Thank you for the quick response. Unfortunately I don’t quite understand it.

Am I not creating a new container instance on line 11? Does this not create my array “theItems”, so I can access and populate it.

4

No. You’re creating an array of Containers with the size 1.

5

You’re creating the array, not the things in the array.

6

Ok. got it.
So this would be the correct approach?

#pragma strict

class Container {
    public var theItems = new Array();
}

private var myCont : Container[];

function Awake () {
    myCont = new Container[1];
  
    var c = new Container();
    var someObject : GameObject = new GameObject("some");
    c.theItems.Add(someObject);
      
    myCont[0] = c;
}
7

Yup - minus using UnityEngine.Array. They’re not type-safe, so better to use List instead.