Option

Option to replace Nullable as in functional programming for Unity.

Table of Contens

• Install
• Getting started
• Serialization

Install

Via Git

add "com.corby.option": "https://github.com/CorbyO/Option.git" to Packages/manifest.json.

Via OpenUPM

openupm add com.corby.option

Getting started

Initialize

Option<int> num = new(); // None<int>
Option<int> num = 3.ToSome(); // Some<>(3)
Option<Transform> parent = transform.parent.ToOption(); // Some<> or None 

Return without null

public static Option<Transform> GetParent<T>(this Transform transform)
{
    return transform.parent.ToOption();
}

Unwarpping

var parentName = transform.GetParent().Unwrap() switch
{
    Some<Transform> parent => parent.name,
    None<Transform> => "None"
};

Serialization

This is a simple example of how to serialize a class or struct that contains Option.

[Serializable]
public struct TestStruct
{
    public Option<int> Number;
    public Option<string> Name;
    public Option<Vector3> Position;
}

[Serializable]
public class TestClass
{
    public Option<Sprite> Sprite;
    public Option<List<int>> Numbers;
}


public class TestComponent : MonoBehaviour
{
    public Option<TestStruct> Struct;
    public Option<TestClass> Class;
}