Let’s say we have to call an external SDK in order to perform any kind of work. This SDK requires a token, and this token is a String.

Some days ago I watched this episode from PointFree , and I wanted to come over with a couple of exercises playing with the arithmetic expression of the exercise.

How many times, we need to validate a form, get usable errors for that validation rules, validate some user data while the user inputs it…

How many times, working with structs, we want to grab a copy, mutate one value, and then return the mutated value. The traditional way of do this, always has been the next lines of code:

This is the last step of a serie named iOS at Scale based on the next steps:

• Introduction
• Xcode at Scale
• Refactor MarvelClient - split client from logic
• Refactor DataProvidersKit - applying Iversion of Control
• Refactor DetailKit - Single data flow, states, type erasure and more
• Refactor Navigator - Back to simplest
• Refactor AppCore - we really need it?
• Dependency Injection - flexible and composable
• Extra ball: Cache made easy
• Extra ball: Introducing to Promises 1
• Extra ball: Introducing to Promises 2
• Final conclusions