diff --git a/examples/generic_pr/main.go b/examples/generic_pr/main.go
index 34b92df..d9665af 100644
--- a/examples/generic_pr/main.go
+++ b/examples/generic_pr/main.go
@@ -20,16 +20,18 @@ func (r *RequestContext[T]) String() string {
 	return fmt.Sprintf("%+v", r.ans)
 }
 
-func do[T any](r *RequestContext[T]) *RequestContext[T] {
-	r.ans = *new(T)
-	res, err := http.DefaultClient.Do(&r.req)
-	if err != nil {
-		r.err = err
+func (r *RequestContext[T]) Do() func(r *RequestContext[T]) *RequestContext[T] {
+	return func(r *RequestContext[T]) *RequestContext[T] {
+		r.ans = *new(T)
+		res, err := http.DefaultClient.Do(&r.req)
+		if err != nil {
+			r.err = err
+			return r
+		}
+		defer res.Body.Close()
+		r.err = json.NewDecoder(res.Body).Decode(&r.ans)
 		return r
 	}
-	defer res.Body.Close()
-	r.err = json.NewDecoder(res.Body).Decode(&r.ans)
-	return r
 }
 
 type someResult struct {
@@ -45,7 +47,7 @@ func main() {
 			req: *r,
 		}
 	}
-	results := lambda.Filter(parallel.Map(requests, do[someResult], 4), func(r *RequestContext[someResult]) bool {
+	results := lambda.Filter(parallel.Map(requests, requests[0].Do(), 4), func(r *RequestContext[someResult]) bool {
 		return r.err == nil
 	})
 	for _, v := range results {