Use slices.Backward in go (#342)

Author: slinkydeveloper

go/patterns-use-cases/src/sagas/bookingworkflow.go

@@ -2,9 +2,11 @@ package main
 
 import (
 	"context"
+	"log"
+	"slices"
+
 	restate "github.com/restatedev/sdk-go"
 	"github.com/restatedev/sdk-go/server"
-	"log"
 )
 
 type BookingRequest struct {
@@ -51,7 +53,7 @@ func (BookingWorkflow) Run(ctx restate.Context, req BookingRequest) (err error)
 	// Run compensations at the end if err != nil
 	defer func() {
 		if err != nil {
-			for _, compensation := range compensations {
+			for _, compensation := range slices.Backward(compensations) {
 				if _, compErr := compensation(); compErr != nil {
 					err = compErr
 				}

go/tutorials/tour-of-orchestration-go/examples/sagas.go

@@ -2,6 +2,7 @@ package examples
 
 import (
 	"fmt"
+	"slices"
 
 	"github.com/restatedev/sdk-go"
 )
@@ -14,8 +15,8 @@ func (SubscriptionSaga) Add(ctx restate.Context, req SubscriptionRequest) (err e
 	// Run compensations at the end if err != nil
 	defer func() {
 		if err != nil {
-			for i := len(compensations) - 1; i >= 0; i-- {
-				if compErr := compensations[i](); compErr != nil {
+			for _, compensation := range slices.Backward(compensations) {
+				if compErr := compensation(); compErr != nil {
 					err = compErr
 				}
 			}

go/tutorials/tour-of-workflows-go/examples/sagas.go

@@ -1,6 +1,8 @@
 package examples
 
 import (
+	"slices"
+
 	restate "github.com/restatedev/sdk-go"
 )
 
@@ -14,8 +16,8 @@ func (SagasWorkflow) Run(ctx restate.WorkflowContext, user User) (res bool, err
 		// All errors that end up here are terminal errors, so run compensations
 		// (Retry-able errors got returned by the SDK without ending up here)
 		if err != nil {
-			for i := len(compensations) - 1; i >= 0; i-- {
-				if compErr := compensations[i](); compErr != nil {
+			for _, compensation := range slices.Backward(compensations) {
+				if compErr := compensation(); compErr != nil {
 					err = compErr
 				}
 			}