From 572c365725eb1b746a30a3447a1e554b418b0372 Mon Sep 17 00:00:00 2001
From: Kyle Ratti <kyleratti@users.noreply.github.com>
Date: Sun, 24 Dec 2023 21:11:25 -0500
Subject: [PATCH] feat: T?.AsMaybe() for reference types

---
 .../Structures/NullableExtensionTests.cs      | 46 ++++++++++++++++++-
 Base/Structures/NullableExtensions.cs         |  3 ++
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/Base.Tests/Structures/NullableExtensionTests.cs b/Base.Tests/Structures/NullableExtensionTests.cs
index a8875b2..69aee17 100644
--- a/Base.Tests/Structures/NullableExtensionTests.cs
+++ b/Base.Tests/Structures/NullableExtensionTests.cs
@@ -1,4 +1,5 @@
-using FruityFoundation.Base.Structures;
+using System.Linq;
+using FruityFoundation.Base.Structures;
 using NUnit.Framework;
 
 namespace Base.Tests.Structures;
@@ -12,4 +13,47 @@ public class NullableExtensionTests
 	[Test]
 	public void TestNullableStructOfValueToMaybe() =>
 		Assert.AreEqual(Maybe.Just(25), ((int?)25).ToMaybe());
+
+	[Test]
+	public void TestNullableReferenceOfNullAsMaybe()
+	{
+		string? nullableString = null;
+
+		var result = nullableString.AsMaybe();
+
+		Assert.That(result, Is.InstanceOf<Maybe<string>>());
+		Assert.That(result.HasValue, Is.False);
+	}
+
+	[Test]
+	public void TestNullableReferenceOfValueAsMaybe()
+	{
+		string? nullableString = "banana";
+
+		var result = nullableString.AsMaybe();
+
+		Assert.That(result, Is.InstanceOf<Maybe<string>>());
+		Assert.That(result.HasValue, Is.True);
+		Assert.That(result.Value, Is.EqualTo("banana"));
+	}
+
+	[Test]
+	public void TestNullableReferenceAsMaybeWorksWithChoose()
+	{
+		string?[] stringCollection =
+		[
+			"banana",
+			"bob",
+			null
+		];
+
+		var result = stringCollection
+			.Choose(x => x.AsMaybe())
+			.ToArray();
+
+		Assert.That(result, Is.InstanceOf<string[]>());
+		Assert.That(result, Has.Length.EqualTo(2));
+		Assert.That(result[0], Is.EqualTo("banana"));
+		Assert.That(result[1], Is.EqualTo("bob"));
+	}
 }
diff --git a/Base/Structures/NullableExtensions.cs b/Base/Structures/NullableExtensions.cs
index b1d950b..fe83db8 100644
--- a/Base/Structures/NullableExtensions.cs
+++ b/Base/Structures/NullableExtensions.cs
@@ -4,4 +4,7 @@ public static class NullableExtensions
 {
 	public static Maybe<T> ToMaybe<T>(this T? item) where T : struct =>
 		item ?? Maybe.Empty<T>();
+
+	public static Maybe<T> AsMaybe<T>(this T? item) where T : class =>
+		item ?? Maybe.Empty<T>();
 }