What's Inside 3DaysOfSwift.com?
- Aug 25, 2025
- 5 min read
What's Inside 3DaysOfSwift.com?
Most Swift learning platforms begin with the assumption that developers need more content.
More videos.
More courses.
More lessons.
More hours.
3DaysOfSwift was built around a different idea.
Many iOS developers already know far more Swift than they realise. The challenge is not always learning new concepts. More often, the challenge is revisiting concepts that have become rusty after months or years of focusing on other areas of development. An engineer may spend six months building networking features and barely think about ARC. Another may spend a year working heavily with SwiftUI and rarely encounter generics, protocol composition, or actor isolation. The knowledge is still there, but it becomes harder to access when it has not been exercised recently.
This is the problem 3DaysOfSwift was designed to solve.
The platform focuses on Swift revision, interview preparation, practical experimentation, and helping developers strengthen knowledge they have already worked hard to acquire.
According to the website, the collection currently contains over 40 downloadable Xcode playgrounds alongside several Xcode projects and interview focused resources.
A Large Collection Of Downloadable Xcode Playgrounds
The core of the platform is a growing wall of downloadable Xcode playgrounds covering many of the Swift language features and concepts that regularly appear throughout professional iOS development and technical interviews. The website describes the collection as being focused on the 29 core language features discussed throughout Apple's Swift language book while also including practical industry topics such as architecture, ARC, concurrency, optionals, and technical interview preparation.
Unlike traditional tutorials that are consumed passively, the playgrounds are designed to be opened directly inside Xcode so developers can experiment with code, modify examples, investigate behaviour, and strengthen understanding through direct interaction with the language. This approach takes advantage of the same playground technology Apple originally introduced for rapid experimentation and learning.
The website describes the playgrounds as a personal "Swift language gym" where developers can revisit important topics and strengthen recall through repetition and practice.
Swift Fundamentals And Core Language Features
One of the strongest themes throughout the platform is the importance of understanding Swift itself before becoming distracted by frameworks.
The collection includes playgrounds covering many of the foundational concepts that interviewers continue to discuss regardless of whether a company uses SwiftUI, UIKit, or a mixture of both. Topics listed throughout the site include strings, control flow, type aliases, optionals, closures, protocols, protocol extensions, value and reference types, ARC, concurrency, capture lists, and modern Swift language features.
This reflects a belief that many developers focus heavily on frameworks while neglecting the language underneath them. The platform repeatedly emphasises that topics such as memory management and concurrency are not advanced concepts reserved exclusively for senior developers but foundational knowledge required to write reliable Swift code.
The Swift Programming Language Book As A Playground
One of the more unusual resources available on the site is a downloadable Xcode playground version of Apple's official Swift language book.
The website explains that the contents of the Swift language guide have been converted into executable playground pages so developers can read explanations while also running and modifying the code directly inside Xcode. It also provides resources based on the older Swift Tour material that Apple previously referenced throughout its documentation.
For developers who prefer learning through experimentation rather than static reading, this approach can make language features feel significantly more interactive because the examples are immediately executable.
Useful official Swift resources referenced throughout the platform include:
Interview Preparation Resources
Interview preparation sits at the centre of much of the platform's content.
The website openly positions itself as a collection of Swift interview preparation resources and repeatedly focuses on helping developers revisit concepts commonly discussed throughout technical interviews. Topics such as ARC, concurrency, optionals, value semantics, protocol design, architecture principles, and technical terminology receive particular attention because they frequently appear during interview discussions.
Several playgrounds are organised in a question and answer style format covering topics such as closures, ARC, concurrency, SwiftUI, capture lists, protocol extensions, and value versus reference semantics. The intention appears to be helping developers practise both the technical concepts themselves and the ability to discuss those concepts clearly.
One observation that appears throughout the platform is that thinking about Swift and talking about Swift are different skills. Many developers understand concepts internally but struggle to explain them confidently during interviews. The resources are designed to help strengthen both sides of that process.
Swift Concurrency, ARC, And Architecture
The website places significant emphasis on several areas that are frequently considered difficult during interviews.
Swift concurrency receives dedicated attention through multiple playgrounds and interview focused resources discussing async and await, asynchronous code, concurrency related thinking, and modern Swift development practices. ARC and memory management are also treated as high priority topics, with the platform explicitly describing memory management as foundational knowledge rather than an advanced specialism.
Architecture principles also appear throughout the collection. Topics mentioned on the site include MVC, dependency injection, inversion of control, architectural terminology, the concept of the model, coupling, and broader software design discussions intended to help developers move beyond simply writing code and begin reasoning about how software systems are structured.
Xcode Projects Alongside Playgrounds
Although the playground collection forms the majority of the platform, the website also includes downloadable Xcode projects.
Examples listed include UIKit based applications, interview style coding exercises such as FizzBuzz and palindrome checking, and projects containing testing related material. These resources appear intended to complement the playgrounds by providing opportunities to explore how language concepts translate into more traditional application development environments.
This combination of isolated experimentation through playgrounds and practical implementation through projects creates a useful balance between learning individual language features and understanding how those features appear in real applications.
Everything Is Now Free
One of the most significant changes to the platform is that the downloadable playground collection is now freely available.
The website currently promotes itself as a free collection of Swift interview preparation resources, downloadable playgrounds, and Xcode projects intended to help developers strengthen their understanding of Swift and prepare for technical interviews. According to the site's published information, the collection includes more than 40 playgrounds, multiple Xcode projects, and a large range of language focused revision material.
This reflects the broader philosophy behind the platform. Rather than focusing primarily on lengthy courses, the emphasis is placed on practical revision, experimentation, and helping developers maintain confidence in knowledge they have already acquired.
You can explore the complete collection here:
Final Thoughts
3DaysOfSwift is best understood not as a traditional Swift course platform but as a Swift revision platform. The site focuses heavily on helping developers revisit language fundamentals, strengthen recall, prepare for interviews, and remain confident discussing topics that may not appear regularly throughout day to day development. Through a large collection of downloadable Xcode playgrounds, Swift language resources, interview focused material, architecture discussions, concurrency content, and practical coding exercises, the platform aims to provide developers with an efficient way to keep their Swift knowledge sharp long after the original learning phase has ended.
Good luck.
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