How to add a Type to a Class in Javascript?

Question

I'm creating a generic class to work with my other classes. This Class takes a Type of T

 public class Heap<T> {
 
 T[] items;
 
 }

I don't know how to write this in Javascript. Its the "public class Heap {" line that throws an error. In javascript I have.

 public class Heap {
 
 var items :  T[];
 
 }

Anyone have an Idea of what I can do?

Answer 1

Answer by MaxGuernseyIII · Oct 20, 2017 at 09:31 PM

I'm not seeing evidence that you can declare a class with a type parametric in Unity's dialect of JavaScript. You can use them.

There are dozens, perhaps hundreds, of of examples of using a generic class in a JavaScript class. However, I can't find any examples of how you might define one.

Maybe the assumption was that people wanting to use parametric polymorphism would want a big boy language anyway? ;)

I don't know. I would just define the class using C#. If you need it to work in non-Unity JavaScript, use Bridge.NET to generate the JavaScript.

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MacDx · Oct 20, 2017 at 09:55 PM 1

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I agree, why would you want generics, a feature that advocates for type safety, in a language that is naturally and essentially type-unsafe like Javascript?

MaxGuernseyIII MacDx · Oct 20, 2017 at 10:20 PM 0

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Yeah. It's a puzzler.

Bunny83 MacDx · Oct 21, 2017 at 03:59 AM 0

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UnityScript is not Javascript(ECMAScript). It's a proprietary .NET language that has a syntax which has been influenced by JavaScript. Yes it allows to use dynamical typing in exchange for massive a performance drop. However nobody uses UnityScript without "pragma strict". With that pragma UnityScript is as typesafe as C# is. It enforces you to use static typing everywhere just like C#.

However you are right that UnityScript doesn't have a way to declare generics (not that i know). In the beginning it doesn't even has a way to declare properties, however now it's possible.

Just to make that clear: I do not use UnityScript, ever (besides when answering questions here ^^).

How to add a Type to a Class in Javascript?

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