From 8e007975f66d83b9d3435149db361ae975ff0f91 Mon Sep 17 00:00:00 2001
From: Kyle Ratti <kyleratti@users.noreply.github.com>
Date: Mon, 25 Dec 2023 14:37:58 -0500
Subject: [PATCH] feat: Maybe<T>.EmptyBind

---
 Base.Tests/Structures/MaybeTests.cs | 48 +++++++++++++++++++++++++++++
 Base/Structures/Maybe.cs            |  6 ++++
 2 files changed, 54 insertions(+)

diff --git a/Base.Tests/Structures/MaybeTests.cs b/Base.Tests/Structures/MaybeTests.cs
index 4acf46a..3a377c6 100644
--- a/Base.Tests/Structures/MaybeTests.cs
+++ b/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));
+	}
 }
diff --git a/Base/Structures/Maybe.cs b/Base/Structures/Maybe.cs
index d319b7c..6d06d0e 100644
--- a/Base/Structures/Maybe.cs
+++ b/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)