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feat: Maybe<T>.EmptyBind

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Kyle Ratti 2023-12-25 14:37:58 -05:00
parent 35d78ee0a5
commit 8e007975f6
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2 changed files with 54 additions and 0 deletions
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48
Base.Tests/Structures/MaybeTests.cs
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@ -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));
}
}

6
Base/Structures/Maybe.cs
View File

@ -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)