feat: Maybe<T>.EmptyBind

Base.Tests/Structures/MaybeTests.cs

@@ -42,4 +42,52 @@ public class MaybeTests
 		Assert.That(result, Is.InstanceOf<Maybe<string>>());
 		Assert.That(result.HasValue, Is.True);
 	}
+
+	[Test]
+	public void EmptyBind_DoesNotBindFactory_WhenHasValue()
+	{
+		var maybe = Maybe.Just(25);
+
+		var result = maybe.EmptyBind(() => Maybe.Just(30));
+
+		Assert.That(result, Is.InstanceOf<Maybe<int>>());
+		Assert.That(result.HasValue, Is.True);
+		Assert.That(result.Value, Is.EqualTo(25));
+	}
+
+	[Test]
+	public void EmptyBind_BindsFactory_WhenDoesNotHaveValue()
+	{
+		var maybe = Maybe.Empty<int>();
+
+		var result = maybe.EmptyBind(() => Maybe.Just(30));
+
+		Assert.That(result, Is.InstanceOf<Maybe<int>>());
+		Assert.That(result.HasValue, Is.True);
+		Assert.That(result.Value, Is.EqualTo(30));
+	}
+
+	[Test]
+	public void EmptyBind_DoesNotBindMaybe_WhenHasValue()
+	{
+		var maybe = Maybe.Just(25);
+
+		var result = maybe.EmptyBind(Maybe.Just(30));
+
+		Assert.That(result, Is.InstanceOf<Maybe<int>>());
+		Assert.That(result.HasValue, Is.True);
+		Assert.That(result.Value, Is.EqualTo(25));
+	}
+
+	[Test]
+	public void EmptyBind_BindsMaybe_WhenDoesNotHaveValue()
+	{
+		var maybe = Maybe.Empty<int>();
+
+		var result = maybe.EmptyBind(Maybe.Just(30));
+
+		Assert.That(result, Is.InstanceOf<Maybe<int>>());
+		Assert.That(result.HasValue, Is.True);
+		Assert.That(result.Value, Is.EqualTo(30));
+	}
 }

Base/Structures/Maybe.cs

@@ -57,6 +57,12 @@ public readonly struct Maybe<T>
 	public Maybe<TOutput> Bind<TOutput>(Func<T, Maybe<TOutput>> binder) =>
 		HasValue ? binder(Value) : Maybe.Empty<TOutput>();
 
+	public Maybe<T> EmptyBind(Func<Maybe<T>> maybeFactory) =>
+		HasValue ? this : maybeFactory();
+
+	public Maybe<T> EmptyBind(Maybe<T> maybe) =>
+		HasValue ? this : maybe;
+
 	public Maybe<TOutput> Cast<TOutput>()
 	{
 		if (!HasValue)