Learn more about Combine

Using Promises and Futures in Combine

Updated on: August 3, 2020

So far in my Combine series I have mostly focussed on showing you how to use Combine using its built-in mechanisms. I’ve shown you how Combine’s publishers and subscribers work, how you can use Combine for networking, to drive UI updates and how you can transform a Combine publisher’s output. Knowing how to do all […]

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Using map, flatMap and compactMap in Combine

Published on: February 3, 2020

Oftentimes when you’re working with Combine, you’ll have publishers that produce a certain output. Sometimes this output is exactly what you need, but often the values that are output by a publisher need to be transformed or manipulated somehow before they are useful to their subscribers. The ability to do this is a huge part […]

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Updating UI with assign(to:on:) in Combine

Published on: January 29, 2020

So far in my series of posts about Combine, we have focussed on processing values and publishing them. In all of these posts, I used the sink method to subscribe to publishers and to handle their results. Today I would like to show you a different kind of built-in subscriber; assign(to:on:). This subscriber is perfect […]

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Publishing property changes in Combine

Published on: January 27, 2020

In Combine, everything is considered a stream of values that are emitted over time. This means that sometimes a publisher can publish many values, and other times it publishes only a single value. And other times it errors and publishes no values at all. When your UI has to respond to changing data, or if […]

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Refactoring a networking layer to use Combine

Updated on: February 10, 2020

In the past two weeks I have introduced you to Combine and I’ve shown you in detail how Publishers and Subscribers work in Combine. This week I want to take a more practical route and explore Combine in a real-world setting. A while ago, I published a post that explained how you can architect and […]

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Understanding Combine’s publishers and subscribers

Published on: January 13, 2020

In my previous post about Combine, I introduced you to Functional Reactive Programming (FRP) and I’ve shown you can subscribe to Combine publishers using the sink(receiveCompletion:receiveValue:) method. I also showed you how you can transform the output of publishers using some of its built-in functions like map and collect. This week I want to focus […]

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Getting started with Combine

Updated on: August 15, 2021

The Combine framework. Silently introduced, yet hugely important for iOS. It didn’t get any attention during the big Keynote at WWDC 2019, but as soon as folks were in the sessions they knew that Combine was going to be huge. It implements a Functional Reactive Programming (FRP) paradigm that’s similar to that of Rx which […]

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Expand your learning with my books

Practical Combine header image

Learn everything you need to know about Combine and how you can use it in your projects with Practical Combine. It contains:

  • Thirteen chapters worth of content.
  • Playgrounds and sample projects that use the code shown in the chapters.
  • Free updates for future iOS versions.

The book is available as a digital download for just $39.99!

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