Extending Angular 2 Promise based service to return data from local Storage.

I have also converted this to a Observables service in this blog post, until then will work as a Promise based service.

Every day we deal with lot of data, some of the data will remain same for years. For example – list of States in Australia. Easy to maintain this data on server side rather than hard codeing it on client side – I am sure you will agree. I have utilised the local Storage to save data on client side, but if data not found it will make a server call to get the data and return them to caller. Belwo is the Angular 2 Service.

Your component can have below code to get the data, prefer to do it in the service level rather than in the component.


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