Combine Asynchronous Programming with Swift

Combine Asynchronous Programming with Swift

Book Details 

             Title: Combine Asynchronous Programming with Swift Ray Wenderlich

         Author: By Scott Gardner, Shai Mishali, Florent Pillet & Marin Todorov

     Publisher: Razeware LLC

    Language: English

        Subject: Swift / Computers & Technology / Programming / Apple Programming

         Format: PDF, EPUB, Full source code

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Chapter2: Publishers & Subscribers

Now that you’ve learned some of the basic concepts of Combine, it’s time to jump in and play with two of Combine’s core components — publishers and subscribers.
In this chapter, you’ll review several examples of creating publishers and subscribing to those publishers using subscribers. By doing so, you’ll acquire important skills that you’ll use throughout the rest of this book and beyond.

Getting started 

Note: There are starter and final versions of the playgrounds and projects you’ll use in each chapter throughout the book. The starter will be prepared and ready for you to enter the code specified for each example and challenge. You can compare your work with the final version at the end or along the way if you get stuck. 

For this chapter, you’ll use an Xcode playground with Combine imported. Open the starter playground found in projects/starter. You’ll see the following:

Chapter2: Publishers & Subscribers

Open Sources in the Project navigator (View ▸ Navigators ▸ Show Project Navigator and twist down the Combine playground page), and select SupportCode.swift. It contains the following helper function example(of:):

public func example(of description: String, action: () -> Void) {
  print("\n--- Example of:", description, "---")

  action() 
} 

You’ll use this function to encapsulate some examples you’ll use throughout this book. However, before you begin playing with those examples, you first need to learn about publishers and subscribers.