Transforming Our Data

The DataPoints interface

If everything goes well, we now have a TaskEither returning a StatsResult array, with each element of the array containing information for a different type of metric (one will, for example, contain data for errors). We’re ignoring the error path for now. So, how do we transform our individual StatsResult elements to an output useful to us (a developer keeping an eye on their applications)? Simple: we’ll use small, composable, and pure functions. We already have a folder and file called transformers, so why not add it all in there?

First, we want the total sum of every individual metric. For clarity’s sake, we’ll dissect the AWS Datapoints type we’re currently returning within StatsResult: