objc.io

We use copy-on-write to write an efficient struct wrapper around NSMutableData and discuss how the standard library uses the same approach.

Episode 20 · Oct 14 2016

We can change structs by mutation, functional chaining, and inout parameters. We discuss how they differ at the call site and why they’re all equivalent.

Episode 21 · Oct 21 2016

We talk about a familiar but surprisingly tricky problem: splitting an array into groups of elements. We discuss the pros and cons of our own solutions along with the solutions people sent us via Twitter!

Episode 23 · Nov 04 2016

We refactor a class hierarchy using a protocol and discuss the differences between both approaches.

Episode 29 · Dec 16 2016

Mutating a nested untyped dictionary can be a challenge. To solve it we discuss the mutability of value types and the concept of l-values.

Episode 31 · Jan 06 2017

We look at multiple ways to create variables that have a class type but also conform to a protocol.

Episode 46 · Apr 21 2017

Swift 4's new features lets us delete code we've written in previous episodes.

Episode 52 · Jun 02 2017

Brandon Kase joins us to show how Swift's type system can be leveraged to check file paths at compile time.

Episode 71 · Oct 13 2017

We clean up our layout code by introducing helper functions that leverage Swift's key paths.

Episode 75 · Nov 10 2017

We write a simple CSV parser as an example demonstrating how to work with Swift's String and Substring types.

Episode 78 · Dec 01 2017

We benchmark the CSV parsing code from the previous episode and refactor it to become an order of magnitude faster.

Episode 79 · Dec 08 2017

We look at how to work with ranges in a mixed Swift String/NSString environment.

Episode 80 · Dec 15 2017

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

Episode 90 · Mar 02 2018

We use Swift's pointer APIs to read a text file and split it into lines without using Swift's collection and string types.

Episode 92 · Mar 16 2018

We discuss many considerations and techniques for working with optionals.

Episode 93 · Mar 23 2018

We're using Swift's Mirror and Decodable APIs to generate database queries for structs in our Swift Talk backend project.

Episode 114 · Aug 17 2018

We implement a custom XML decoder that allows us to decode responses from an XML API using Decodable.

Episode 115 · Aug 24 2018

We add support for arrays by implementing an unkeyed decoding container and use custom decoding logic for dates and URLs.

Episode 116 · Aug 31 2018