objc.io

We discuss how Swift's type system can be used to eliminate impossible states from our code.

Episode 153 · May 24 2019

We implement fold on the CommonMark syntax tree and use it to extract links and text from a document.

Episode 152 · May 17 2019

We explore the differences between reduce and fold and how they can be implemented on any enum.

Episode 151 · May 10 2019

Wouter joins us to explore the origins of the reduce function.

Episode 150 · May 03 2019

We show a refactoring of the view code in the Swift Talk backend that allows us to pass around dependencies automatically using a functional pattern.

Episode 141 · Mar 01 2019

We extend a basic Markdown library using protocol composition to add support for syntax highlighting in Swift code blocks.

Episode 91 · Mar 09 2018

We implement a concurrent version of the map method for arrays.

Episode 90 · Mar 02 2018

We show how protocol composition can be used to design extensible libraries, thereby solving the so-called "Expression Problem."

Episode 89 · Feb 23 2018

We discuss the capabilities and limitations of enums and classes when designing extensible libraries.

Episode 88 · Feb 16 2018

We look at different techniques for wrapping analytics APIs in Swift and discuss their advantages and disadvantages.

Episode 83 · Jan 12 2018

We refactor a simple flow layout to have a functional interface, disentangling the layout code from UIKit code.

Episode 82 · Jan 05 2018

Building on the binary search tree code from episode #56, we implement red-black trees as self-balancing tree data structures and benchmark their performance.

Episode 58 · Jul 14 2017

We look at binary search trees as an alternative to last episode's sorted array implementation. We benchmark the performance of insertion and lookup in both data structures, with some surprising results.

Episode 56 · Jun 30 2017

We build a flexible sort descriptor abstraction on top of Swift's native sort methods, which is dynamic and type safe.

Episode 19 · Oct 07 2016

We implement some of the more challenging parts of parser combinators.

Episode 16 · Sep 16 2016

Join us in the functional programming gym to stretch your object-oriented comfort zone while we lay the groundwork for a parser combinator library.

Episode 15 · Sep 09 2016

We add customizable styles to our CommonMark renderer from episode #2.

Episode 4 · Jul 01 2016

We create attributed strings from CommonMark. We continually refactor our code to make the central logic short and understandable.

Episode 2 · Jun 17 2016