Struct in JavaScript

Questions & Answers
1

Hello,

Is there a way to make a structure in JavaScript? I mean not class but structure as Vector3 for example. For creating big fast arrays. Something like this:

struct SomeStruct{
var i : int;
var f : float;
}

var arr = new SomeStruct[1000];
arr[500].a = 3;

In a case of class I need to initialize every member of the array...

3

A struct is basically a value type so you can try something like this:

class SomeStruct extends System.ValueType{
  var i : int;
  var f : float;

  public function SomeStruct(i:int,f:float){
     this.i = i;
     this.f = f;
  }
}
2

Turns out it is possible (Thanks to Senhor de todo o Mal for pointing that out)

class YourStruct extends System.ValueType
{
    //code
}
4

Building on the example given by Senhor de todo o Mal. Save the following script in your Standard Assets folder:

class SomeStruct extends System.ValueType{

//fields
var i : int;
var f : float;

//Constructor 
public function SomeStruct(i:int,f:float){
 this.i = i;
 this.f = f;
}
//Method
public function PowerOfI(a:int)
{

    for (var index:int = 1; index<a; ++index)
    {
        this.i = this.i * this.i;
    }

}

}

Now create a new js script as follows:

function Start () {
    //Make a new SomeStruct with uninitialized fields
    var myStruct:SomeStruct = new SomeStruct();
    //Set field i
    myStruct.i =5;
    //Test it
    Debug.Log(myStruct.i);
    //Make a new SomeStruct with initialized fields
    var myStruct2:SomeStruct = new SomeStruct(5, 2.3);
    //Test it
    Debug.Log(myStruct2.f);
    //Use a struct method
    myStruct2.PowerOfI(2);
    //Test it
    Debug.Log(myStruct2.i);
}

So yes, you can create structures in Unity JavaScript.

5

This has annoyed me for days. Doing it the way Senhor de todo o Mal did it does not make the struct show up in the editor. Then I found this in another answer:

class Test extends System.Object {
    var p = 5;
    var c = Color.white;
}
var test = Test ();

And now it shows up in the editor as well. I hope it saves others some time.