diff --git a/fn/stream.go b/fn/stream.go
new file mode 100644
index 000000000..9974eb467
--- /dev/null
+++ b/fn/stream.go
@@ -0,0 +1,13 @@
+package fn
+
+// Map takes an input slice, and applies the function f to each element,
+// yielding a new slice.
+func Map[T1, T2 any](s []T1, f func(T1) T2) []T2 {
+	r := make([]T2, len(s))
+
+	for i, v := range s {
+		r[i] = f(v)
+	}
+
+	return r
+}