diff --git a/schala-lang/language/src/prelude.schala b/schala-lang/language/src/prelude.schala
index 11188da..61868e0 100644
--- a/schala-lang/language/src/prelude.schala
+++ b/schala-lang/language/src/prelude.schala
@@ -2,3 +2,12 @@
 type Option<T> = Some(T) | None
 type Color = Red | Green | Blue
 type Ord = LT | EQ | GT
+
+
+fn map(input: Option<T>, func: Func): Option<T> {
+  if input {
+    is Some(x) -> Some(func(x)),
+    is None -> None,
+  }
+}
+