feat: T?.AsMaybe() for reference types

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"));
+	}
 }

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>();
 }