Swift in 100 Seconds

Swift is a modern programming language developed by Apple. It is commonly used to code apps for iOS and MacOS, but is open-source and can be used outside of Apple’s walled garden.
#apple #programming #100SecondsOfCode
🔗 Resources
Swift Docs www.swift.org/
Swift Announcement • Video
Kotlin in 100 Seconds • Kotlin in 100 Seconds
C in 100 Seconds • C in 100 Seconds
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🎨 My Editor Settings
- Atom One Dark
- vscode-icons
- Fira Code Font
🔖 Topics Covered
- What is Swift?
- Swift vs Objective C
- Apple Swift Basics
- Swift Syntax and Memory Safety
- When was Swift Announced?

[@Fireship]

Subscribe to my walled garden of content 🍎

[@Phoenix-CM]

I love the kids that say "First reply" EDIT: They can't do that now :)

[@johntony366]

Do C# pleaseeee

[@pilearn1266]

Swift is love ❤️

[@rishabsharma5307]

Can you make a video on "How to research like a pro"

[@JB-fh1bb]

I appreciate this joke

[@saeedbaig4249]

I played around with Swift back when I used to use Mac and I have to say… Swift is the most sensible, sane and pleasant language I’ve ever used. Simple for easy beginner things yet gives all the features & efficiency you could want for serious applications. Shame it doesn’t really exist outside of Apple’s ecosystem.

[@randomizednamme]

It’s getting there slowly, async/await and other new async features other languages don’t have were just added, as well as better Windows support, so I can see web servers becoming more popular in the next year or two once things catch up

[@farhandikazahrir6657]

@@randomizednamme even without async await, it's a great language. but the adoption rate tho, low

[@adlsfreund]

@@randomizednamme better memory management and generics improvements are on the way now too!

[@markuspfeifer8473]

@@adlsfreund waiting for Rust-like ownership, higher kind types and opaque return types with specifiable associated types. And it would be good to get better specialization guarantees for generic types. Oh, and Vapor could really use a complete overhaul inspired by composability patterns seen e.g. in SwiftUI, but swift on the server isn’t really a big thing yet

[@markuspfeifer8473]

Caveats: XCode sucks and the compiler sometimes takes minutes to spit out a mysterious segfault without indication what the actual problem was. But it’s not much worse than with other languages. And in return, you get a package manager for which you don’t need to learn another language - it’s swift!

[@Ma1ne2]

Anyone else wanting to see LLVM in 100 seconds?

[@carlwestman9343]

Was just going to write this!

[@davidjensen6215]

Oh yes plz!

[@hamadrehman853]

absolutely

[@xgxfhzxfuhfjgfhgf]

yes

[@mastermati773]

Comm of support.

[@elmomertens]

Thank you for covering Swift! If I may add something here, in Swift structs are commonly used in place of classes. They are similar in terms of functionality, but each one has its own strengths and weaknesses. And also, inheritance is not really a common occurrence in Swift, instead people tend to write protocols - Of course, you can still make a class that inherits another, but writing with protocols makes your code more modular and composable! There are a lot of interesting and useful language features that cannot possibly go into a 100 second video, so I hope people will take more interest in Swift 🥳

[@HDSQ]

Are protocols like interfaces in Java and C#? How do they work?

[@UltravioletMind]

​@@HDSQ i don't know java or c# but protocols allow you to add custom functionality to structs ,classes and other types that conform(implement) to certain specs that you can define in the protocol. If a struct conforms to a protocol it will gain the functionality implemented in the protocol. It is a very powerful tool which lets you extend and "inherit" functionality by simply conforming to a protocol. you can even create protocols for built in types like arrays etc. eg you could add a protocol to arrays to return all indices of a value in the array. and any array will have access to the protocol.... so long as the array conforms to the protocol ( eg. the elements would probably need to be identifiable; which is also a protocol)

[@georgeelsham]

@@HDSQ Yep, similar to Java interfaces. In Swift you can declare properties and methods that a conforming class/struct/enum etc must conform to. You can also create default implementations for these properties and methods like in Java.

[@tanaykamath1415]

@@UltravioletMind looks like Kotlin extension functions

[@mainaksengupta6248]

You have successfully sold me to pick up swift, thank you good person on the internet.

[@pelicanoe]

Swift is really underappreciated as just being a good and modern programmming language

[@tanaykamath1415]

The issue is that one needs a mac inorder to build native iOS apps

[@swordz2330]

@@tanaykamath1415 yeah thats stupid. I use linux on my main pc arch btw but use an iPhone as my main mobile device so I cant really develop apps for iOS. Also its really expensive. I guess its just the apple way of doing things

[@OcnarfPro]

@@tanaykamath1415 I installed macOS on roblox

[@select_from_users5842]

@@aayushtheapple arch users are the vegans of Linux

[@aayushtheapple]

@@select_from_users5842 damn true

[@jeanjpnm]

"It uses automatic reference counting to manage memory automatically" _proceeds to show memory that will never be released_

[@lanye2708]

the best part is you can't tell if he's joking or not

[@31redorange08]

@@lanye2708 I can. He isn't.

[@tigergold5990]

@@31redorange08 Yes he is lol

[@codediporpal]

@@lanye2708 He likes to throw in these little easter eggs.

[@everyhandletaken]

Awesome timing, was recently giving Swift some thought, as my next unnecessary play thing 🤓

[@georgeelsham]

I would definitely recommend it!

[@abh1yan]

Report

[@WillAmaral29]

Me too, “What should I invest my time in learning while leaving tons of unfinished side projects?”. Swift was one of the options, so I guess Swift it is.

[@oluwolegideon3968]

Same here...

[@everyhandletaken]

@@WillAmaral29 😂 😂 I thought it was just me that does that- glad I’m not alone ☺️

[@paragjyotideka1246]

Learning to code swift, from a nodejs, react background, and have to say, it truly feels like a language that Apple developed. It just makes sense.

[@mad_t]

XCode was also developed by Apple. And calling it shit would be a praise. Obj-C is a bloody mess, and it was also made by Apple. I guess you can see my point. Made by Apple doesn't mean good and sane.

[@paragjyotideka1246]

@@mad_t lol, have you used android studio?

[@l_ravid]

⁠​⁠​⁠@@mad_t Obj-C wasn’t made by Apple, but by Tom Love and Brad Cox. NeXT (founded by Steve Jobs) used it for its operating system NeXTSTEP, and later Apple bought NeXT, this is how it became the main language on their platforms. The syntax looks strange indeed, but if you consider it was released before C++ (in 1984), and inspired by Smalltalk, it's a different story.

[@zakharkholboiev842]

Thank you very much, Jeff! I appreciate your content 🙂 Waiting for: - WebWorkers in 100 seconds - WebStorage (including indexedDB, WebSQL) in 100 seconds - Repaint/Reflow in 100 seconds - Critical Rendering Path in 100 seconds

[@creeper283]

If your critical rendering path takes 100 seconds, you might have a performance problem!

[@boiimcfacto2364]

The day Jeff makes repaint/reflow in 100 seconds is the day newbies will be able to steal my job, so no thanks XD

[@zakharkholboiev842]

🤔

[@Gregorius421]

Exquisite choice of topics.

[@MhdSamad96]

Great video 👍 A small detail is that at 1:25, it should be “colon” instead of “semicolon”

[@max_mittler]

thanks, watched that part five times thinking I was missing it

[@sinisterrectus]

yeah i too noticed that

[@joecardenas7015]

Swift is amazing! Some more terms to research would be: Protocol Oriented Programming (Protocols), Structs in Swift, If Let syntax. There’s more but those are the first ones I thought of. Also, through the Swift Evolution process, more development is always being done to make the language more powerful and easy to use.

[@farhansangaji5029]

Great language in overall, thanks for the explanation. It feels like i got more in this 100 seconds than me procrastinating the whole day

[@abh1yan]

@Rafly Tzy report

[@farhansangaji5029]

@@abh1yan roger

[@ssholum]

That's why I'm here. Now I can complete the day thinking that I've done at least something productive! Now, back to procrastinating.

[@abh1yan]

@@ssholum bravo

[@farhansangaji5029]

@@ssholum bravo

[@urk5204]

Swift is easily one of my favorite programming languages. It being protocol-oriented really helps as well

[@leo-hao]

i know its a series, but this was the perfect opportunity to name the video "Swift, swiftly"

[@JulianShalaby]

one who has worked with Swift, I really appreciate how approachable yet powerful it is as a language. The syntax is clean and expressive, making it easy to read and write code. And the tight integration with Apple's frameworks allows for efficient development of high-performance apps. Swift has been a game-changer for iOS/macOS app development.

[@PetePeteRepeat]

PLEASE make more videos on Swift! Maybe on the SwiftUI and UIKit frameworks? I love your channel and this has been my favourite video so far!

[@Gregorius421]

"Congratulations! Your app is now ready to seek approval on the apple appstore." The main lesson 😂

[@escapadechannel8379]

Now i a fully fledged IOS swift developer after this tutorial thanks man.

[@Pho3nixHun]

The syntax is insanely similar to Typescript.

[@bob_kazamakis]

The swift “let” === js “const” definitely trips me up a lot

[@thespacejedi]

It's even more similar to kotlin

[@sergten]

I was gonna say.

[@bakedbeings]

Also like Nim

[@user-qi7kk7su3l]

@@thespacejedi it's rather the other way around, Kotlin is similar to swift

[@jaeyoungchoi]

If it weren't for Swift, I would not have even touched iOS development. Objective C is downright unenjoyable to look at

[@harunadess]

A more fitting ending might have been "..your code is now ready to seek rejection from the App Store" - since we know how particular and arbitrary they can be. Maybe not with code in general, but with app functionality.

[@liamveary]

Please do Lua in 100 seconds!

[@artoshia]

And also Luau! (it was recently open sourced, (its a variant of lua but with types and many other useful functions including much more speed!))

[@OcnarfPro]

@@artoshia roblox lua

[@chinmayk8004]

Swift seems like the perfect high-performance version of JS! Amazing vid Fireship!!

[@paragjyotideka1246]

It is. And Swift UI is insanely similar to React/React Native.

[@shinomitsu7798]

You know your content is awesome when people thank you for making them spend money. Just bought lifetime access. Thank you Jeff

[@AkshatSinghania]

There is one jeff who makes awesome content for developers in 100 secs , and then theres the evil jeff who went to space for 100 secs

[@illuzati]

Underrated comment

[@daleryanaldover6545]

Jeff: "Swift is open source so you can create something outside apple platform". Me: That's great Jeff! few seconds later "Congrats for watching till the end, you can now publish your work on apple and hopefully they approve your work." Me: Wait...what?!

[@bakedbeings]

Thing you can do != most common use case

[@AMIRBENDABI]

Since printing "greeting" has such difficult syntax in Objective-C, I now kind of wonder how a function that iterates through an object looks like.

[@ad_sidera_virgines]

1:02 i really like those file extentions that are actually longer than the file name itself

[@sungjuyea4627]

I think when only considering the syntax of Swift, it is a much more sophisticated version of TypeScript. On the other hand, being an iOS or a macOS developer using Swift is a totally different story. There are tons of APIs you need to learn, and sometimes you should need to read some C/Objective-C codes. But I find the weakest part of this language is the size of its community. There are not many open source projects in Swift and sometimes you should implement your own or you must find alternative libraries written in C/Objective-C.

[@randomizednamme]

I think this is partly due to differing philosophies between JS and iOS communities. In the iOS world we try and limit the number of dependencies in an app to a small number as it can affect app launch times, not to mention library authors need to update them in a timely manner when Apple breaks shit. So we tend to avoid adding dependencies for small things if possible. This is becoming less true though so if Swift gets wider adoption outside of iOS then I can see this “improving”.

[@ben_car_8115]

Outside of the Apple ecosystem there is a pretty vibrant Swift backend server community (see Vapor)

[@leontius5502]

This was pretty swift, good job man!

[@Maartz]

Furthermore, Swift is much more Protocol Oriented., It uses protocols (interfaces) to extends the types of a struct/class. It forces the usage of Structs rather than Classes. Mainly because classes are passed by reference. Hello again mutability. You can also easily extends a built-in protocol by using extensions. And if you want to make a backend application, KItura from IBM and Vapor are great tools to get started!

[@ladhibidda]

protocols = typeclasses generics = polymorphic types structs = product type enums = sum type

[@joeseabreeze]

One of the best languages out there. I wish it were more popular outside of the Apple eco

[@rahiyansafin449]

C# please!

[@maximcoppieters]

I'd absolutely love a full tutorial i've wanted to use it for a long time

[@red010182]

The best part of Swift is protocol and extensions. It's pity that they're not mentioned in this video.

[@aniketfuryrocks]

Indeed, Swift is a very good language, on power with rust and go. Had it been for the language to be loosely coupled with apple, it would have seen better adoption on multiple platforms and environments.

[@parev_arav]

> on power with rust and go Largely depends on the context. Rust and Go are in different leagues of there own, e.g. Go would not be the language to implement a kernel. > loosely coupled with apple,it would have seen better adoption on multiple platforms Not sure I agree. If we look at Kotlin, which is not loosely but **largely** coupled with Android development, Stack Overflow Developer Survey shows Kotlin as more loved than Swift. In the same vein as Swift, Kotlin supports multiple platforms via its Kotlin Native via LLVM, the same compiler toolchain as Swift. I think Swift is a very fine language, but I'm not sure if it innovates more than other languages, hence why it's stagnated in adoption outside of iOS.

[@saadisave]

@@parev_arav The Swift developers do not prioritise multi-platform support, which is a design goal for Kotlin. That alone explains the difference.

[@MrHamsterbacke756]

@@parev_arav Why do you think Kotlin is largely coupled with Android development? Kotlin is pretty popular for backends too.

[@DaddyFrosty]

man macOS truly has some of the best forced rendering options you can instantly tell ur writing code in macos cuz of how smooth the font is.

[@Basil.01_]

Hello Sir, I have two questions 1. Can I learn Swift as my first programming language? 2. Can I learn Swift without any Apple device(Macbook, iPhone, iPad)?

[@PetrovichErochin]

You can learn swift as a first language and Apple has an app for iPad for this: Swift Playgrounds. You can still learn without any apple product, but you would have a Linux machine because swift doesn't have a compiler for windows yet. If it doesn't suit you, I would recommend more classical lanugage like C++, C# or Java/Kotlin as a first language

[@casadogaspar]

I think you missed the point when not talking about POP (Protocol Oriented Programming), that is one of the biggest features in Swift. It's so easy to abstract stuff and decouple your code, SOLID principles are so easy to follow. and everything is testable with low effort.

[@ci6516]

Ok time to update git and resume .. -knowledgeable and skilled in swift programming

[@fiveoneecho]

Swift is one of my favorite languages to write in, although I've only built like two projects with it and usually am using C++ or Java.

[@ProjSHiNKiROU]

Programming language design variations across multiple languages (Swift/ES6/Rust/F#): var/const/let/‘let mut(able)’ and fn/fun/func/function

[@wlockuz4467]

As a mobile developer, I like it when big companies accept that their current language is not up to the mark and create something new from scratch instead of just patching the old and creating more drawbacks than benefits. Google did exactly this with Java and Kotlin for Android!

[@vibovitold]

no, they didn't do "exactly" this. Kotlin was created by JetBrajns, not by Google. Google adopted it as an official language for Android, and contributed to its development, but they didn't create it, much less "from scratch".

[@sjn_]

Find someone who loves you as much as Jeff loves One Dark theme

[@naahh4498]

Who doesn’t love dark theme?

[@sjn_]

@@naahh4498 I didn't only say dark theme, I'm specifically talking about One Dark theme from Atom which you can see in all Fireship videos.

[@vin5718]

The video is very good but Swift has a couple strong points probably personally should get more spotlight on like structs which is a much lightweight approach for representing data, the new concurrency features with async/task, tasks, and actor model, protocol oriented programming allowing seem-less composition with extensions and type constraints. Those are strong points for me personally. Still great video though 👍

[@randomizednamme]

Swift has a lot of features, hard to fit into 100 seconds ;)

[@legenddairy8346]

watching this, I learned so much more about swift than in the past two days of trying to learn from tutorials 😨

[@iOSAcademy]

Great video!

[@virtualscale]

here we are 2 years later, I with I could pay you guys. You lit taught us how to code.. for freeee.

[@Leuel48Fan]

Clean syntax, very similar to Kotlin. Both mobile platforms (Android/iOS) have nice underlying development languages

[@orc13a]

These short videos about languages and other things are golden. Keep them coming 🤩🤩

[@ch4r4cter]

Why doe this look like JS and Python combined?

[@pookiepats]

Hmm i wonder why it looks like the two most popular languages on earth…HMMM HOW DID THIS HAPPEN HMMMMMM

[@alltaxationrequirescops]

Never insult Swift like that again

[@ckingpro]

Objective C wasn't used by Apple since the 1980s. Only NEXT used it. Apple used Pascal for the old Mac OS (before Mac OS X), but after buying NEXT, Objective C came along with it for Mac OS X

[@bobbyv3]

Swift really is a great language. My favorite to code in.

[@mcj1m_noonewillfindthis]

Hey, could we get a 100sec video of an esoteric programming language? I think it would be quite fun...

[@daleryanaldover6545]

speaking of which, youtube just recommend me watching chicken and brainf*ck esoteric languages

[@anata.one.1967]

I will never write if (maybe == nil), but I appreciate you writing like that for those who are from C++.

[@ibukunokunoye4795]

Switft and Kotlin are so similar, wow!

[@hurensohn7605]

I really hope the language gains sole track outside of the apple ecosystem. I love it so much.

[@prhasn]

Wow! I thought I was watching an overview about the language not an actual comprehensive crash course. I am speechless.

[@mcritz46vl]

I love Swift: use it daily. I think Swift developers need a Fireship joke-summary of Swift so we can laugh at ourselves. Especially because our once tidy, slick language keeps getting more esoteric than a Murakami novel.

[@AbhinavKulshreshtha]

So basically an apple version of Kotlin language. I know there are differences but basic language stuffs feels similar.

[@daycred]

i love how seriously you say "multi paradigm language" every time :D

[@Ihavetoreturnsomevideotapes]

*Spring in 100 seconds*

[@samyogdhital]

Fireship literally explaining the full basics of any technologies within 100 seconds.💥

[@bity-bite]

C# next please

[@peopleofourtime2523]

Awesome video! If you do one for C#, please don't tie it down to Unity. It is much more than that. The Unity compiler is extremely outdated.

[@OcnarfPro]

Please, C# is only Unity

[@peopleofourtime2523]

@@OcnarfPro That’s like saying C++ is only for Unreal Engine and Lua is only for Roblox games

[@OcnarfPro]

@@peopleofourtime2523 it is tho

[@peopleofourtime2523]

@@OcnarfPro :|

[@BrianHarris]

@@OcnarfPro Unity is a engine that supports the C# language natively. C# is not only Unity. C# is used in web applications, desktop applications, console apps, windows services, etc. C# as a language pre-dates the creation of Unity by 4 years.

[@Librax1110]

Amazing job as always! Can you do a "R in 100 seconds" video?

[@johnswanson217]

What a coincidence! I was considering learning swift for a lottie implementation on RN ios. By the way, how about some JS animation library in 100sec?

[@pedroelton7040]

Green Sock and Framer Motion would be great!

[@lonelybud]

first time saw swift in action. Seems so cool and easy to get started with.

[@limo9402]

For a intuitive guy like me this sound so interesting better than any other coding language because easy coding language is actually more advanced if you really think about it. Nice, one Steve jobs

[@angeltorres7048]

Steve jobs didn't have any involvement in its development. It was introduced way after his passing.

[@manin1]

I always watch your video to know about concept of any programming , thank for you making amazing video.

[@sithumvikasitha8811]

I still stucked in between swift and dart can I get an advice about what should I master and continue?

[@jacobyoung2045]

Fireship can never run out of videos

[@promptagonist]

can you make a 12 minute long video on swift?

[@rishavagrawal8861]

This is my first time seeing swift language syntax but I feel the syntax closely comparable to Kotlin.

[@xtopy9145]

I've been considering playing with swift for a while now. This video made it soo incredibly easy to get some grip. You made it seem incredibly similar to JavaScript which greatly helps take off some edge. I love how you explain things. Looking forward to a 'Beyond 100 seconds' with swift :) cheers!

[@cryonim]

When we say 'crossplatform' we exclude mac and the entire apple family, because apparently you need a mac/iphone to get your app working on them. Most people can't afford that or just don't like mac/iphone so the dev ecosystem isn't as fast moving as the web/android.

[@whoman7489]

one of these codes can easily be passed as typescript… i’m actually baffled by how syntactically similar they are!

[@MercyFromOverwatch2]

Jeff is still my favourite tech youtuber

[@danielwatson6529]

i learned swift as my first language- now i pick up new ones dead easy

[@WilbertVerayin]

Well, Quasar can have a single codebase for Mobile(Andriod, IOS), PC(Windows, Mac, Ubuntu), and web browsers. I'd love to see a 100 seconds video for that.

[@goswami7275]

Great video! Could you do a Quasar in 100 seconds please?

[@johnsnow1749]

Odd that they chose to exclude Protocols and Extensions. I think it's part of what makes it so great.

[@TriNguyen-ym3hf]

So this is kotlin of ios world, both lamguage are pretty the same. Im familliar with kotlin so I hope that learning swift will not so harsh :)

[@abh1yan]

1 million soon

[@Fireship]

Maybe before 2022 if we're lucky!

[@naimurhasanrwd]

Like this video a lot. Great work! ❤️

[@erlicthemad]

The parts I like is the type safety, and the memory safety. Many common bugs in other languages don’t make it past the compiler here. With the addition of a sync await. It just got hugely better. There is still 1 surviving web backend that is pretty good. Great if you want nearly bulletproof middle wear.

[@BitBrain0]

No mention of protocols?! I know there is a lot to cover in 100 seconds, but POP is at the core of Swift.

[@abbashussain7298]

wasn’t expecting this one but i am pleasantly surprised

[@HungNguyen-pu1dv]

I used to think that swift could only run on Mac. Thank you so much

[@aspeno5613]

fantastic thank you! I'm so tired of sitting through 10 minute videos that try to teach me how to code again

[@JaySlimCodes]

I mastered swift in 100 seconds. Thank you

[@toxaq]

I’m glad they made ‘let’ mean const because otherwise it would just be typescript.

[@connorgreene8834]

I would like to see Haxe in 100 seconds, It allows you to compile your Haxe code to java,cpp,lua,php and is very usefull to make a full-stack application

[@anthonymikinka]

So you can run and build swift apps in visual studio code on windows?? That’s nuts

[@phucnguyen0110]

Finally, thank you, Jeff!

[@abh1yan]

Report

[@trappedcat3615]

"let" in JS should have signified a constant like in Swift. Scope or block keyword should be used instead of the let JS.

[@HeyItsHades]

Just use const

[@christiansimbarashe]

May we have an Objective - C in 100 seconds video?

[@samuel01411]

If I recall correctly you can call C or objective C with swift

[@DimitrisSartzetakis]

Yes for example you can put an “@objc” above a function to make it an objective c one

[@lanceang795]

My man makes every language the best

[@ermiasbunaro]

Thanks, Awesome content. The full swift tutorial would be amazing.