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The Grandaddy of Swift Code Examples!
Xcode Playground File - Swift code examples
The downloadable Xcode file is at the end of this article. 👇
What is it?
Weather you are learning Swift or reminding yourself of the huge variety of language features, it will be VERY HELPFUL to own as many Swift resources as possible. In fact, if you could write down every single language feature in one file you would own an invaluable asset and learning resource. This article aims to provide such a document.
How Do I Use it?
We created one Xcode playground file and populated it with as many code examples as we could possibly think of; All in one file.
As a group of developers who often attend interviews, we understand the difference between knowledge and bringing information to the forefront of your mind. You see, information fades in the mind. You will never be able to learn every language feature or memorise how a specific evolving framework operates - the memories fade and the behaviour changes with every year that goes by. Instead of attempting to know everything, it is far greater an accomplishment to figure out how to use things that you don't know or have't memorised.
This Xcode playground file is a long scrollable file designed for you to browse in a waiting room, or to execute the morning of your interview.
By reviewing the syntax (words used in code) of a large amount of Swift language features the morning of our interview, you will bring this information to the forefront of your mind. This will (in terms of physics) provide a fresh mental store for your mind to draw from in an interview situation, allowing your brain to have super-fast access to the correct syntax of Swift features. In most cases you may often find yourself correcting and leading the interviewer in the correct approach to writing code in Swift; All because it is freshly stored in the mind!
How Do I Learn Swift?
We provide an online course to teach beginners the Swift language and how to use it (at a basic level). Navigate to 3DaysOfSwift.com/learn-swift to enrol.
How to Pass an Interview?
Having information fresh in your mind is the key. We recommend practicing every day and night including the morning of your interview (which is extremely important) to keep this mixing bowl of Swift knowledge fresh and easily accessible for your brain to quickly provide the correct answers to you when asked and grilled in an interview.
How to Practice Writing Code in Swift?
Easy. Download the Grandaddy of all Swift code examples and write each and every example again in a new playground. Practice makes perfect. So... copy each example. Write it again. Then write it again and again and again. Finally, repeat until bored of the ungodly repetition; Repetition is the key to learning.
DOWNLOAD
Below is the Xcode playground file. Download it. Read it. Execute it and finally, write each example again in a new Swift Xcode playground file (but only if you want to be the best 😎).
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Frequently Asked Questions
Do I need to learn SwiftUI to get a junior job?
No. Swift is required. SwiftUI can be learned on the job.
Is Swift hard to learn?
Swift is approachable but deep. Structured learning makes it manageable.
Can I learn Swift in a weekend?
You can start in a weekend, but mastery takes consistent practice.
Is Swift still worth learning in 2026?
Yes. Swift remains the foundation of the iOS ecosystem.
How do I prepare for Swift interviews?
Practice language features, not UI layouts. Use executable examples.
Summary: Learn Swift First, Everything Else Follows
If you want to learn Swift in 2026, focus on the language — not the noise around it. Free resources are abundant, but clarity is rare.
Platforms like 3DaysOfSwift.com exist to remove confusion, shorten learning curves, and help you build confidence where it matters most: in Swift itself.
If you’re serious about starting a career in iOS development, begin with Swift. Everything else can come later.
Our Free Products at 3DaysOfSwift.com
The Swift Cheatsheet ⚡️
123Calc Xcode Project
All products are free. Some require signup. All are designed to help you learn Swift faster — and properly.
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3 Days Of Swift Bootcamp
Learn Swift by enrolling in our 3-day online bootcamp. We have 3 days of instructional videos pair programming with our experienced instructor and Senior iOS Developer who guides you to write code for each main language feature of Swift.
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Swift Study Guide
Also, as an additional bit of help 3DaysOfSwift has the Swift Study Guide (listed below and to download), which is a list of Swift language features each iOS Developer should know before applying for jobs in the tech industry.
List of Swift Language Features
Download the list of topics (Swift language features) you will be required to know in order to pass an interview for an iOS Developer role.
Download as PDF
Beginner Topics
Topic 1: The Basics & Foundational Types
Topic 2: Control Flow
Topic 3: Optionals
Topic 5: Classes
Topic 6: Structs
Topic 7: Enums
Topic 8: Value Types & Reference Types
Topic 9: ARC (Automatic Reference Counting)
Mid-level Topics
Topic 10: Extensions
Topic 11: Protocols
Topic 12: Concurrency
Topic 13: Error Handling
Topic 14: Generics
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A Career in Swift
Also, as an additional bit of help 3DaysOfSwift has outlined a few career tips that might help as you start your journey as an iOS Developer applying for jobs writing software for Apple devices.
Tips
Below we have included a few career tips to help get you started as a Junior iOS Developer working in the tech industry.
Focus on learning the Swift language itself. Most team members start their learning journey by studying Xcode and building apps. It's a lot of information and plenty to get confused about. Most of your colleagues will have many gaps in knowledge that affect their every-day anxiety with completing tasks and having it reviewed by others. Instead, why not become the one of the reviewers? Our advice is to stand out in the tech industry and if you want to stand out I would suggest becoming very knowledgable about the language itself; Every single developer will be using it and they will all be competing over Architecture and not the best use of language features. Armed with an incredible understanding of the language you will have the confidence in knowing you can maintain any existing product on the market.
Gather "Career Things" like they were collectibles in a game. This easy-to-remember and rather broad term is a great bit of advice. Too many engineers let the months go by without really taking on board many exciting projects or doing anything that wows any one. This is a terrible idea in every way. Stand out. Be the best at something (like understanding the language). When you change positions and apply to a different company you will have an interview and they'll grill you with many questions. The main bits to know are these; Your CV gets you the interview. You display your worth in the interview.
Your CV gets you the interview: Your short 2 page bullet-pointed CV is simply a list of amazing things you did to improve the team, the social element, the code quality, the income, how you increased user retention, how you added a successful feature and improved the app. You must collect career things.
You display worth in the interview: In the interview you want to fill the hour with saying similar phrases non-stop to "I was able to tweak the values and affect the income of the product simply by reducing the friction of the onboarding and providing a more seamless and pleasant user experience for the user. We now have only a 14% drop compared to most companies that have around 30% typically." Notice how you use "we" when referring to your current company in interviews. To simplify the phrase just-used, "I helped my company move forward. I improved the product, which led to an increased user experience and ultimately more profits for the company. I am a team player and I will improve your company at every opportunity possible."
Become confident in Interviews. You are now a talented Swift engineer who understands the Swift language and has a list of successful results you can pull out of the bag and discuss and any interview. You are constantly and infinitely talking about specifics of the Swift language and how cool and useful it is. You are stacking up one example after another of how you affected the results of the team and the company. You are great at telling these stories. The world is your oyster and you can be confident in your abilities as well as your choices in life.
Move company every 2 years. Ask for a £10,000 increase. When you become bored at your current job because you know too much think about moving, upgrading your job title and doubling your annual salary.
Be driven and be proud that you help keep the world moving by maintaining the digital services we all love and are constantly glued to.
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Why not take our online bootcamp and learn Swift in a weekend?
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Welcome to our community of 3DaysOfSwift.com students!
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We are not affiliated with 100 Days of Swift. If you want to learn SwiftUI please visit HackingWithSwift.com.
Apple developer tutorials for SwiftUI can be found here.
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