objc.io

We build a UI for creating chains of async algorithms and visualizing the results.

Episode 307 · Jun 03

We refactor our code to support combining multiple async algorithms.

Episode 306 · May 27

We add support for more algorithms, like zip and combineLatest, and clean up our code.

Episode 305 · May 20

We add drag gestures to make the input streams interactive.

Episode 304 · May 13

We transform arrays of events into async streams, run the merge algorithm on them, and visualize the result.

Episode 303 · May 06

We start a new project to visualize the algorithms from the new Swift Async Algorithms package.

Episode 302 · Apr 29

We add cancelation to the AsyncStream-based interface of our web crawler.

Episode 290 · Feb 04

We refactor our web crawler to report its results via an AsyncStream instead of an observable object.

Episode 289 · Jan 28

We use Swift's manual continuation APIs to replace a Task.sleep in our web crawler.

Episode 288 · Jan 21

We parallelize the web crawler using a task group and an actor for synchronization.

Episode 287 · Jan 14

We start implementing a concurrent web crawler to experiment with task groups and actors.

Episode 286 · Jan 07

We bridge between URLSession's delegate methods and an async version of the delegate protocol.

Episode 284 · Dec 10 2021

We experiment with modeling delegate callbacks as events in an AsyncStream.

Episode 283 · Dec 03 2021

We explore ways to bridge between the old and new concurrency worlds using tasks and continuations.

Episode 282 · Nov 26 2021

We start implementing a download manager as a sample project for exploring Swift's new concurrency model.

Episode 281 · Nov 19 2021

We look at the two different ways async streams can be used and how this relates to memory usage.

Episode 272 · Sep 17 2021

We leverage async/await to write synchronous parsing functions for asynchronous streams of data.

Episode 271 · Sep 10 2021

We build two more async sequences: one to flatten sequences of data, and another one to parse XML.

Episode 270 · Sep 03 2021

We dive into Swift's new async APIs and implement async sequences for chunking and decompressing data.

Episode 269 · Aug 27 2021

We show a parsing technique that we use for many parsing tasks in our day-to-day work.

Episode 170 · Sep 20 2019

We refactor our string interpolation code to allow concatenation of multiple interpolated SQL queries.

Episode 144 · Mar 22 2019

We use Swift 5's new string interpolation API to automatically insert placeholders in SQL queries.

Episode 143 · Mar 15 2019

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

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

Episode 115 · Aug 24 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 discuss many considerations and techniques for working with optionals.

Episode 93 · Mar 23 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 implement a concurrent version of the map method for arrays.

Episode 90 · Mar 02 2018

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

Episode 80 · Dec 15 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 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 clean up our layout code by introducing helper functions that leverage Swift's key paths.

Episode 75 · Nov 10 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

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

Episode 52 · Jun 02 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

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

Episode 29 · Dec 16 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 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 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