My iOS Developer Courses - seanallen.teachable.com

That 15 minutes just saved me so much time developing my first native macOS app. Thank you!! Best Swift tutorials on UKposts.

WOW! The most Clear and concise explanation I've seen on closures in 6years of developing.

I’m going to be honest with you, this was a G-R-E-A-T explanation. I’ve read so many Medium posts and Stack Overflow answers where people either try to sound too smart or they just don’t realize that they’re not speaking in layman’s terms (they’re speaking to other people who don’t need it explained). This took a very simple approach to something complicated and made it simple. FANTASTIC explanation!!! You do a great job of keeping things simple! Seriously. And I like your graphics!

(well)->(explained) {Thanks a lot for great video}

What a wonderful tutorial, clear but also full of knowledge. You really helped me understand the book of swiftUI, thanks a lot !

Before I start this video, I started searching for videos on closures , while actively using “100 days of SwiftUI” lesson plan, but during the first couple lessons involving closures, I could not get out of my head the question “If functions do everything closures do, why then do closures even exist?” So hopefully I get that answer from this video, because this thought it slowing down my ability to progress in learning swift.

Simple, nice and clear. Thanks for the video, Sean!

Thank you so much for clearly explaining the $0 and $1 in closures. I have read and studied it so many times but now I just got it in 1 minute. Thank you!

Awesome video, Sean! Thank you for all the work you do!

best teacher i found about swift fundamentals

Excellent explanation, thank you so Much Sean

I've just started delving into the mystery that is closures. Your video helped both for what they are and, especially, why I will need to know them. Thanks!

Thanks, that cleared up some things I’ve been putting off for a long time 👍🏻

Excellent content! This answered so many questions quickly and kindly 👏

Wow, Sean. You are a very good teacher. Thank you for this. 👍🏼

Sean you are without a doubt my number 1 iOS teacher. Thank you.

Was confused AF going through swift tour, but this video really cleared everything up.. thanks!!

my issue with this video is it isn’t a discussion of closures in swift but a discussion of a syntactic sugar for function pointers. unless i missed something, there wasn’t any point where you “closed over” or captured the environment when creating the closure, which is an essential part of closures. i assume you can also do this in swift closures but it wasn’t shown here

This video came at Great time , currently figuring out this developing game.🙏🏾

Extremely useful video. I came here for closures and learnt so many things I was confused ab all in one go thanks

Hi Sean! I've been working on my programing career for about 2 months now. I'm doing the 100 days of swift with Paul Hudson. Even tho this is all still a bit blurry i do appreciate your content since its starting to clear a bit of the fog that i had. Just wanted to stop by and say thanks! You'll probably see me around a bit more ✌

Hey Sean, thanks for this. Can you make a video about Callbacks? Differences between completion handlers and Callbacks?

Super understandable! Thank you for this video, finally i've got it 🤝

Well done, great explanations 👍

Finally my Javascript knowledge helps me out. I picked these up quickly.

8:30 sweet. Gave a special style to the video.

Not a swift dev but some good information here that if you already know this it makes it connect from a different perspective. Great video

closures are my favourite part of Swift

Excellent examples! Now do the same example with Async Await

I absolutely loved the Swift Closures Explained video by Sean Allen. As someone who has struggled to understand closures, this video was a godsend. Sean does an amazing job of breaking down the confusing aspects of closures, like what the parenthesis mean and the shorthand syntax. He explains everything in a clear and concise manner, making it easy for even a beginner like myself to follow along. I also appreciate the fact that Sean provides a promo code for Squarespace at the beginning of the video. It’s always great to get a discount when you’re starting a new website or domain. Overall, I highly recommend this video to anyone who is struggling to understand closures, or anyone who wants to brush up on their Swift knowledge. Thank you, Sean, for creating such an informative and helpful video.

I’m on my phone so not sure if this has been said before but it took me a while to figure out how to sort on multiple values…. Tuples!!!! { ($0.score, $0.name) > ($1.score, $1.name) } This will sort first by descending score, then by descending name. To sort by DESC score and ASC name: { ($0.score, $1.name) > ($1.score, $0.name) }

Thanks for the great videos, closures have been a source of mystery for me since I started. One question, in the first example, is the closure being passed in as a type for topStudentFilter?

Code magician, expecting more :) with closure and SwiftUI

Hey, very interesting! Just needed some advice on when should I use a function or computed property with closures?

I should have known that I could trust another Sean to explain this well

Another good one.

very good video!

really nice thanks

Chuckled at the escaping one 🤣

Where did the .filter come from? Is it part of the standard library (foundations) along with append, etc.?

"empty parentheses and Void are the same thing" - man oh man, this is the kind of stuff that takes hours off the head banging waste of time trying to learn

A Question, is the var topStudentFilter always recalculated when 1. Its called, or 2.when the student array is changed, or3. at both times.

Looking for ways to identify closures when we see their address in memory graph during debugging. So often they just show an address. Is it possible to make a trailing closure more recognizable in mem graph? Or to find a closure by address wile debugging? Or to print the address of a trailing closure?

awesome

Thank you for your explanation. Coming from typescript the curly brackets kinda confused me alot. This video really explained well how SwiftUI are just bunch of shorthand ways of writing trailing closures. Could you explain the following code for me? I know what it does, but how did this shorthand version got formed? What would it's "full hand" counterpart be? ``` Button { showDetail.toggle() } label: { Label("Graph", systemImage: "chevron.right.circle") .labelStyle(.iconOnly) } ```

Hi Sean are closures like object in java where you can call them whenever you need them

I am a fan but I think Dr Angela Yu’s course explain it a little better this time.

“@escaping ? …. Who are we running from?” 😂

Should I invest my time in Swift UI or UIkit? I'm an experienced Android developer and just starting to learning iOS development to boost my portfolio; not necessarily trying to get a job as an iOS dev at least for the next 1 - 2 years

Can I see a closure as an interface like in Java

Suggestion: When teaching to beginners, use unique variable names throughout your code and try not to repeat them between functions that don't end up passing the variable out of it anyways… @6:25 you talk about how we could have used 'persons' instead of 'student' but are using 'student' because it "makes more sense, they're students"… but I see the name 'student' being used at least 13 times on that one screen alone. As stupid as it sounds when I'm learning the new syntaxes I type in variable names like "sparkleUnicorn" and "bubaTheBillyGoat" (silly name placeholders) to keep track of where the variables actually point and go to. When the tutorial overloads with one word being re-used over and over again it just makes my head spin.

So now think of escaping as you’re putting popcorn in the microwave. But it’s taking so long to pop, you ask that one friend who’s in the kitchen to wait for it to finish popping and bring it back to the living room?

slow down plz

The video is great! But his definition of a a closure isn't correct. He says that closures are functions that can be passed around. But all functions can be passed around. The real difference between a closure and a function is that a closure has access to variables in the parent scope without needing to pass them in as arguments. This is a Square-Rectangle relationship. All closures are functions but not all functions are closures. What this video shows is that Swift has a short syntax for defining closures that makes them easy to use functions. But the shorthand syntax isn't what makes it a closure. Non-closure functions don't have access to variables in the parent scope unless you pass them in as arguments. Closures can just access variables in the parent scope without having to pass them in as arguments. The examples in this video are good for creating functions with a shorthand syntax that match the function signature but the examples in this video aren't unique to closures. In Swift all functions are closures. If you define a function (not with closure syntax) in Swift inside of a scope it will have access to variables in the parent scope. This makes it a closure. But this isn't true in all languages and is an implementation detail of the language.

Most easiest concept in swift is closure

As a flutter developer who is learning SwiftUI I must say that it is the most horrible syntax I have seen for such a simple mechanism known in many other languages ​​such as "Callbacks".

You are speaking much too fast. A learning viewer needs pace to process your information.

I love this!

Thanks!