Functional Core in a Shipping App

April 15, 2019

In this workshop, we’ll look at how to build a functional, testable core and how to use it with different iOS app architectures.

In Swift we emphasize immutability, value types, and the use of generics, higher-order functions, and closures. We may be writing Swift apps, but the frameworks our iOS and Mac apps are built on are still written in Objective-C. Foundation, UIKit, AppKit, and other frameworks are based around reference types and the familiar design patterns we’ve used for years with these frameworks.

Our goal is to explore strategies to successfully blend these two worlds.

We’ll begin the workshop by test-driving an immutable model. We’ll then use this model in a basic table based app. We’ll then experiment with different architectures to emphasize how we can isolate and take advantage of the best of Swift in a robust and flexible iOS app.


The actual contents may vary on the day of training but the likely topics are:

  • We begin by test-driving a simple model

  • We adjust to make the model instance immutable

  • We specialize the model to take advantage of recent additions in generics

  • We build out a use of the model that illustrates MVC

  • We introduce a view model

  • We rearchitect using MVVM

  • We evolve to a reactive like architecture

Student requirements:

It is assumed that you are an experienced programmer who has spent time with Swift. You will need a Mac running the latest version of Xcode.

Register Today!

About your instructor


Daniel Steinberg

Daniel is the author of the best selling books A Swift Kickstart and Developing iOS 7 Apps for iPad and iPhone (the official companion book to the popular iTunes U series from Stanford University taught by Paul Hegarty).

He has written apps for the iPhone and the iPad since the SDKs first appeared and has written programs for the Mac all the way back to System 7.

Daniel presents iPhone, Cocoa, and Swift training and consults through his company Dim Sum Thinking. His books are available on the iBookstore. When he’s not coding or talking about coding for the Mac, the iPhone, and the iPad he’s probably cooking or hanging out with his daughter.

@dimsumthinking /