NEW: Start my new Ultimate Portfolio App course with a free Hacking with Swift+ trial! >>

Protocols and extensions summary

You’ve made it to the end of the ninth part of this series, so let’s summarize:

  1. Protocols describe what methods and properties a conforming type must have, but don’t provide the implementations of those methods.
  2. You can build protocols on top of other protocols, similar to classes.
  3. Extensions let you add methods and computed properties to specific types such as Int.
  4. Protocol extensions let you add methods and computed properties to protocols.
  5. Protocol-oriented programming is the practice of designing your app architecture as a series of protocols, then using protocol extensions to provide default method implementations.
Hacking with Swift is sponsored by Instabug

SPONSORED Catch bugs as soon as they happen and know exactly why a crash occurred. Instabug's SDK grabs all the logs they need to fix bugs, crashes and performance issues in minutes instead of days. Get screenshots, device details, network logs, repro steps, and tons of other critical insights needed to resolve issues and prioritize product backlogs straight from your dashboard. It only takes a minute to integrate!

Get started now

Sponsor Hacking with Swift and reach the world's largest Swift community!

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 4.9/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.