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A few things to note:

• We are now dealing with FunctionalDataOperation<Result<Element, AnyError>>. The question is, can we do better?
• This is a follow-up to the article: Making Core Data Functional.
• Before we start, here’s a quick overview of FunctionalDataOperation.

Thread safety

Many operations in CoreData are wrapped in either an async perform blocks, or their synchronous counterpart performAndWait . Both referred as the perform blocks hereafter.

Introduction

Swift’s very first error handling API (i.e. try-throw-catch), was first introduced in Swift 2.0 to allow developers to propagate errors irrespective of the return type. We will re-implem…