A major feature of Outboard, my iOS app written with ClojureScript on React Native, is the ability to add places to your lists from a share extension inside Apple’s Maps, Google Maps, Yelp, or other apps that supply URLs. React Native ships with AsyncStorage, a LocalStorage analog for iOS and Android apps, but on iOS, that data is sandboxed to the app alone. To share between an app and an extension, you need to use App Groups, and roll your own persistence layer to interact with it. In this article, I’ll explain how to do that. You should first have an App Group set up on the developer portal and have an entitlement to it added both your app and its extension; you can follow this guide to get to that point.

Thanks to everyone who came out to my talk at Clojure PDX last night. Code for the demo project is on Github and the slides are available here.

In part one and part two of this series, we looked at how to build a ClojureScript environment that we can deploy to AWS Lambda and the API Gateway that will respond to the outside world as a web service. With that done, today we’ll see how to go about deploying it.

One of the common synonyms for “serverless” is “Function as a Service”: there is a place in the cloud that we upload a function to, and it runs when some event is triggered. Web services are easily modeled as functions in Clojure/Script, so that’s how we’re going to set ours up.