add options.IsNoneOrZero

Also, add the tests for IsSomeAnd and IsNoneOr that I forgot.

2 files changed, 14 insertions, 0 deletions

diff --git a/options/options.go b/options/options.go
index e058559..9754e2d 100644
--- a/options/options.go
+++ b/options/options.go
@@ -20,3 +20,11 @@ func FromPointer[T any](value *T) Option[T] {
 		return Some(*value)
 	}
 }
+
+// IsNoneOrZero returns whether the Option is either empty, or contains a zero value.
+func IsNoneOrZero[T comparable](o Option[T]) bool {
+	return o.IsNoneOr(func(value T) bool {
+		var zero T
+		return zero == value
+	})
+}
diff --git a/options/options_test.go b/options/options_test.go
index 69a4b43..9947b9d 100644
--- a/options/options_test.go
+++ b/options/options_test.go
@@ -17,3 +17,9 @@ func TestFromPointer(t *testing.T) {
 	AssertEqual(t, FromPointer[int](nil), None[int]())
 	AssertEqual(t, FromPointer(PointerTo[int](42)), Some(42))
 }
+
+func TestIsNoneOrZero(t *testing.T) {
+	AssertEqual(t, IsNoneOrZero(None[int]()), true)
+	AssertEqual(t, IsNoneOrZero(Some(0)), true)
+	AssertEqual(t, IsNoneOrZero(Some(1)), false)
+}