Over the last decade, I have worked as an iOS developer in many different teams. While basically all teams described themselves as being agile, it never felt so. For most, “agile” had become a meaningless word, just describing a marketing term for a certification industry. But “agile” has meaning. Agility…

Create fully immutable types for your domain using Swift — I want to demonstrate how we can use Swift’s type system to efficiently and effectively model and implement behavior. The emerging code is easy to read, as they resemble spoken English to a high degree. And the fact that each module exposes one method makes them simple to test and…

Exploring declarative domain paradigm — I want to introduce you to Declarative Swift — a coding style that allows us to efficiently and effectively create domain-driven code that is easy to verify. Writing code like this has proven to be faster than conventional coding, while it offers less room for bugs to hide in. Domain Examples Let’s…

I want to introduce a fabulous game. It requires strategic thinking, courage, psychology, negotiation skills — and the occasional backstabbing. It is aptly named «Diplomacy». It is set in Europe of 1901 in the prelude to World War I. The game’s objective is to occupy at least half of the…

How to use Swift’s Types to create modules — Datatypes, UseCases, Features — that will be controlled through a vocabulary defined by their Domain Specific Languages (DSL) — As these vocabularies are finite sets, this kind of coding has proven to enable the coding of even complex domains in simple fashions and in very little time — think hours, whereas conventional coding needs weeks. DSL Interfaced Datatypes

Let me show you “Khipu,” an architecture with a twist: It uses DSLs (Domain Specific Languages) to encode business logic and connect different modules — The UseCase Module UseCases are the main architectural building blocks in Khipu. They define Requests and Responses. In most cases, a request is passed to an UseCase which will respond synchronously or asynchronously with a response. UseCases implement a protocol with associated types — a “PAT.”

In this article, I want to introduce you to what I call “Axiomatic Coding” which results in easy-to-understand code and uses a style that is simple to scale to any size — from small games to full-featured apps with a multitude of functionality. I’ll be using Swift, as its type…

Code Katas are training codes that experinced coders use to evaluate their current coding abilities. Transforming integers into string…

A deep dive into this fully declarative and immutable solution for everyday projects — MVVM-(X), VIP, VIPER — all these so-called architectures have two things in common: They all trace their ancestry to Robert C. Martin’s Clean Architecture. I have not seen one of those being valid architectures in iOS. …