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Thank you, even after 6 years, your code and teaching is still actual

Awesome video! I like how you reinforced the "throw" keyword in there. 😃 The repetition makes it stick! Thanks, Sean.

If I have to learn any difficult concept, I look up your videos. You explain it better than anybody else.

I love this series for it's organization and simplicity. There are far too many hour long tutorials on these fundamental concepts. You explain it well and show people it's not as hard as many people make it out to be. Subscribed. Cheers

Dude every question I have about iOs, you have a video on it... thx A LOT!!! Happy new years!

Thanks for putting this example into context. Please continue to do your videos so that it's easier to understand where to use these programming concepts.

Thank you for the rapid explanation, Do, Try and Catch were confusing me. I am surprised to see no less than three Bang Operators !

Hey Mr. Allen, firstly, thank you for everything. I don't know how I discovered you has a wonderful, simple and understandable explanation. I'm a CS student in Ankara Bilkent University. I really wanted to learn swift but it was very complex until I find you. I cannot explain how happy I am, please continue to create these great videos ,series and keep it complete and simple. Thank you again. (sorry for the grammar mistakes)

thanks for making these videos!! could you do one on regular expressions in swift and how to use them to validate data users put in text fields?

Crystal clear of do try catch! Thank you!

Very useful. Thanks Sean!

This was by far one of the best and most practical explanations of Do/Try/Catch I have seen!

Thanks for continuing your interview series.

Another great video from this series! Detailed and yet easy to understand. Thanks.

Best tutorial ever for swift error handling , really thank you.

Well I'm a beginner developer and I really needed to see some videos about iOS development and etc. I found your channel and enjoying so far. Thanks man :)

Your videos are just what i needed all the time thank you

Good job! I finally got it

my favorite series ... thanks a lot ...

Great video. Thanks

Love your videos man! You are putting out some great content. Thanks for your time and effort.

awesome stuff. thanks a lot for this content :)

Excellent example for "throw"

Nice Video!! Can you explain what is the difference between throws and rethrows?

Nice explanation Sean! I’m really enjoying your videos! I know it’s crystal clear to everybody, but please note that the magically code that actually logs you in will be performed asynchronously in the background (obviously). So make sure to handle the successful login request properly, and put your transition code there, instead of simply putting them the next line right after try login(). Otherwise the control will be given back to your do block, where the remaining code will be executed before the login response arrives.

bro dont have words you are just great at explaining some people are flaunting their talent by making complex code i agree they know some good stuff but you make swift look easy #highlymotivated

Short and simple... Superb :)

Another excellent share, thank for your the clear explanation

Great tutorial, thanks a lot :)

Very helpful!!!!! Thank you very much! :)

Thanks Sean, This video is very helpful , Can you please make sure that if their is any way to write all error cases in another swift file ? If it is possible, please give an example as I am new in swift so I am facing some problem to write this code.

Great Video Sean!

Thank you!

Have a question about the Do, Try, Catch syntax? Leave a question below!

hey please make more videos on interview question and answers.

Great.. I’d expect if you include odd scenarios too, at the end of each video

Hi Sean. Thank you for the great tutorial. Is there a way to throw nothing in a function that throws? e.g (I don't want to create class or enum inherit from Error and return that object.)

I love the Alert handling, well done. But I discover the "class func", what is it ?

Very helpful video

Awsome) Thanks a lot!

The thumbnail looked like a Nike commercial lol (do... try... catch)

Awesome!​

Hi Sean .your videos are awesome .teaching skills are great.Please upload some videos for Core Data,Fetch Controller,Fetching large no of records from API ,Writing into Core Data and Displaying them into Table View concurrently.Thanks In Advance.

Hi thank you for this video, I have never seen both enum error cases, and a do try catch being used in the same function, were you just giving an example of how to use both, or do you usually do that only when there is a throw included? I ask because I imagine that if there is a throw included inside of the function, we only really need to use a do try catch block and can print out the error to do displayed to the user and do not need the enum cases? does this make sense ? Which is preferred?

Great video, love the speed of your speech. I hate slow talkers!

Beautiful !

hey can u explain how to use nspredicate to filter strings

love u brother from another mother !!

Is there a way to define error messages in enum and just use one catch and throw relevant error message ?

Thanks for all your work on your channel! Quick question: could we instead of catching each error separately have a single ´´´catch let error { ... } ´´´ and do a switch on the error property inside?

Hey Sean, very nice tutorial, just download code . I wonder how did you setup the constraint of the all ui elements, did you setup constraint for each ui element, or you use suggested constraint for all. Maybe a tutorial about view constraint next time?

Hi Sean, I'm a beginner in Swift, and I'm wondering how did you able to use the function in class Alert without instantiating it? or i just overlooked it somewhere? sorry for newbie question..

is it possible to put the enum in a separate file? I just started learning swift.

Really helpful vídeo man I Man doing a Udemy course but they don’t explains this that well

The question I'm sure many have is: why use this instead of *if / else* statements? What is the actual advantage of using Do Try Catch?

why there is a double if statement, why if else is not use instead ?

Nice! But forgot to mention the try! And try? There some cases to use it as well

Hi Sean, What's best architecture for developing longterm product? Now i'm using Viper for my product.

Hey! Do you suggest using storyboards or doing everything programmatically in big projects?

Hey Sean. As a beginner, I'd like to ask you something. When you started learning, did you focus on the language alone (swift) and OOP concepts, and then moved to more core issues like algorithms? Is there any tip you could give me as a beginner? What would be the best way to learn swift and get better understanding of OOP?

Is the isValidEmail extension written in a mix of Swift and Objective C? The emailFormat looks akin to it

Sean, what your methodologies when coding? I feel that some times I get lost in code because I don't have a general sense of direction when a problem may arise. I'm trying to get better, typically would write python scripts but now that I am getting into this type of development and using more and more files such as classes to fulfill the application its hard planning. It can kinda be discouraging but I feel like its something common and all you need is the right sense of direction when stuck.

When an iOS job applicant is at an onsite interview are they generally allowed to bring a paper notebook or iPad to use as a reference during the coding exercises? (algorithms excluded)

Hello Sean, if I understood try catch is only for throwable methods. But how I can catch error from nonthrowable function or method. Example: let a = String(data: someData, encoding: .utf8) . Some times it it crash and application crash. Can I catch this error? Thank you.

If this is real life situation then IF statements would be changed for GUARD, right? Is there a practical difference between those two ?

Can I ask about the regular expression for the email validation? I see that [A-Z0-9a-z._%+-] means any of those characters in the brackets and the + means one or more times, then you have the @ symbol which makes sense. After the @ symbol, you have [A-Za-z0-9.-]+ which is basically the same thing as above without a few of the special characters. My question starts here: \\. I know that \. means "." because it has to escape, but why the extra "\"? I think I also understand the end: [A-Za-z]{2,64} means A-Z and/or a-z anywhere from 2 to 64 times, right? Thanks! This is really helpful; it's the first time I've seen regular expressions in Swift and honestly didn't know it was possible before this video.

Bro u are too good. How long have u been coding swift ?

Nice video again,sean how we can implement pager in ios like android

Hi, Can you provide a starter project along with full source code.

Hi Sean! Have a question: In case - we don't need error (wich in catch block) - can we use something like: let isLoggedIn = try? login() ?? false (login() returns true in case of success)?

hello, you variable isValidEmail : bool , then put the { } , what is this, you add a closure behind it, so it will be executed everytime ? sorry i am a newbie, see this sometimes, don't know wut it is officially called ?

What is really confusing about Swift syntax here is the implicit `error` inside the catch block, when you might already have an error defined above.

Great content, but feel like they should be supplemented with examples of how they are applied within the context of iOS development similar to this video

imo it would be better to handle the title and message of the error inside the error enum, that way you can just call the alert message once. Nevertheless, probably the best video I've come across on error handling.

great

bro i have a request that i feel that once in a week for an hour you should interact with us for our queries or doubt if you can give one hours of your precious schedule it will be pleasure for us waiting for yours zoom , google meet link

sean, when variable looks like yours : var isValidEmail : Bool { ..... return ..} Is this a computed property or what?

Sir, What is a helper method?

Hey Sean why we use " static var"

using api is not that easy i am stuck on it can you explain it for us as i am a beginner

Thanks for your video. I wih to ask one thing: How can I implemente an error handling in the code below? Presently it doesn't work because it doesn't throws errors. It gives these warnings, in xcode: No calls to throwing functions occur within 'try' expression and 'catch' block is unreachable because no errors are thrown in 'do' block Thank you for any help, if possible. DispatchQueue.main.async { do { self.name.text = MyAccountViewController.nameofuser self.email.text = MyAccountViewController.email self.sessions.text = "\(MyAccountViewController.active_device_sessions)/\(MyAccountViewController.max_devices_sessions)" self.plan.text = MyAccountViewController.userplan try MyAccountViewController.used_disk_space = ByteCountFormatter.string( fromByteCount: Int64(MyAccountViewController.used_disk_space)!, countStyle: ByteCountFormatter.CountStyle.file ) try MyAccountViewController.max_disk_space = ByteCountFormatter.string( fromByteCount: Int64(MyAccountViewController.max_disk_space)!, countStyle: ByteCountFormatter.CountStyle.file ) try self.space.text = "\(MyAccountViewController.used_disk_space)/\(MyAccountViewController.max_disk_space)" } catch let e { debugPrint("failed to get user data: \(e)") } }

This video has some gems 0:44, 1:55, 10:15 and maps this up to the GUI here: 12:18 and as an added bonus "Feel free to steal this:" 11:39