Author Archives: Josh Smith

About Josh Smith

Josh Smith is a musician at heart, and a software developer by obsession. He lives in Arizona, plays classical music on the piano, jazz on the guitar, and enjoys brutally long rides on his bicycle. He has a wonderful wife and thinks that, in general, life is good.

Concealment design pattern in Swift

This article introduces a design pattern that I call Concealment, and demonstrates how to use the pattern in Swift code. Purpose The Concealment pattern enables types to support novel, related functionality without adding nonessential members to their interface. Motivation User-defined types can easily be overused in a codebase, giving more prominence to … Continue reading

Posted in Swift | Tagged | 1 Comment

Analyzing a dependency graph in Swift

I published my solution to Dave Thomas’s Transitive Dependencies programming exercise, known as a kata, to GitHub: https://github.com/ijoshsmith/transitive-dependencies-kata The Challenge This exercise involves analyzing a graph data structure which contains nodes that “depend on” other nodes. A graph is represented as direct dependencies between nodes: The objective is to find all … Continue reading

Posted in Swift | Tagged , | 1 Comment

DRY Fusion data munging kata in Swift

I worked through one of Dave Thomas’s programming exercises, called a kata, and pushed my Swift 2.2 code to GitHub. The code shows how to apply the Don’t Repeat Yourself (DRY) principle to two similar but different data processing programs. The end result of … Continue reading

Posted in Swift | Tagged , | 1 Comment

Creating an iOS Wizard UI in Swift

I published a reusable framework, written in Swift, for implementing the Wizard UI design pattern, named Wizardry. It simplifies creating a user interface composed of multiple view controllers that enables the user to complete a task. This is a particularly important UI design pattern for mobile apps … Continue reading

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Stones on a beach

Suppose that you arrange stones into a spiral on a sandy beach. After meticulously arranging your stone spiral, the world seems hell-bent on destroying it. A dog steps on some of the stones, a big wave carries some of them … Continue reading

Posted in Thoughts, Uncategorized | 8 Comments

Find keys by value in Swift dictionary

Here’s a helper method that might come in handy when working with a Swift dictionary. It finds every key mapped to a particular value. This is similar to the allKeysForObject(_:) method of NSDictionary, but it is generic so it can return … Continue reading

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Striving for excellence as a software developer

I’ve been a professional software developer for over a decade, and have been writing code since I was a kid. Over the years I have read a lot of advice from software developers with far more experience than me, to expand my thinking and … Continue reading

Posted in Sustainable Coding | 4 Comments