Update publish-subscribe.ts

docs-snippets/publish-subscribe.ts

@@ -224,9 +224,9 @@ pubnub.unsubscribe({
 // create a subscription set with multiple channels
 const subscriptionSet1 = pubnub.subscriptionSet({ channels: ['ch1', 'ch2'] });
 
-// create a subscription set with multiple channel groups and options
+// create another subscription set with multiple channels and options
 const subscriptionSet2 = pubnub.subscriptionSet({
-  channels: ['ch1', 'ch2'],
+  channels: ['ch3', 'ch4'],
   subscriptionOptions: { receivePresenceEvents: true },
 });
 
@@ -236,3 +236,28 @@ subscriptionSet1.addSubscriptionSet(subscriptionSet2);
 // remove a subscription set from another subscription set
 subscriptionSet1.removeSubscriptionSet(subscriptionSet2);
 // snippet.end
+
+// snippet.AddToExistingSubscriptionSet
+// create a subscription set with multiple channels
+const subscriptionSet1 = pubnub.subscriptionSet({ channels: ['ch1', 'ch2'] });
+
+// subscribe to the set
+// start receiving events from ch1 and ch2
+subscriptionSet1.subscribe();
+
+// create another subscription set with multiple channels
+const subscriptionSet2 = pubnub.subscriptionSet({ channels: ['ch3', 'ch4'] });
+
+// add the new set to the initial set
+subscriptionSet1.addSubscriptionSet(subscriptionSet2);
+
+// you're now receiving events from ch1, ch2, ch3, and ch4
+// because the set has been subscribed to previously
+
+// create and add another subscription to the set
+const channelGroup = pubnub.channelGroup('channelGroup_1');
+const subscription2 = channelGroup.subscription();
+subscriptionSet1.addSubscription(subscription2);
+
+// you're now receiving events from ch1, ch2, ch3, and ch4 and channelGroup_1
+// snippet.end