Introductions to Closures in Swift

[@medicaldoctoronyoutube]

Thanks a lot for your video. Perhaps the best I've seen on this topic. Watching your videos from Russia, Moscow.

[@benyaminabediyan5451]

Usually I don't write any comments but thank you Stewart; you helped me understand this damn concept. Really appreciate your work. hope you would start making a full fledged course on Swift and SwiftUI.

[@root_pegasus]

I've paid for the "best" content in Udemy and nobody explains like you It's amazing that content like this is free

[@StewartLynch]

I am glad you are finding it useful

[@pifeeder9027]

Best explanation on closures I have ever seen

[@christophgeisel9708]

I have been struggling to understand Closures and tried all kinds of reading materials and tutorials to no avail. This tutorial was simply amazing and if it’s any further indication of the teaching style, why did I not find you sooner 😆

[@StewartLynch]

I guess I have to improve my advertising :).

[@spacemeter3001]

This video is worth GOLD. Struggled to understand the syntax of closures and how they're used but now I understand it thanks to your examples!

[@StewartLynch]

Thanks. That is what I set out to do. Appreciate the feedback.

[@sawjaixx711]

THANK YOU!!! Your detail explanation helped solve my confusion.

[@StewartLynch]

Great. Glad it could clarify for you.

[@Landon_Hughes]

Closures are definitely one of the more confusing topics in Swift; this video explains them perfectly!

[@absar66]

This is called quality tutorial with calm instructions...many thanks 👍

[@eyupmert7338]

Amazing. I really can't say anything else. I was struggling with closures, it's hard to understand because it's hard to explain I guess 😅 But you found a great way to explain the topic. Incrementing the level of knowledge slowly with different examples. And showing behind the scenes slowly. That's it! 👏

[@StewartLynch]

Glad it helped!

[@mhfs61]

As always, very educational Stewart. No voodoo, just calm and clear explanation. 👍🏼👍🏼👍🏼

[@FRkiddo]

this is great, your style of explaining is really good

[@kal5211]

Excellent. Thank you.

[@abhiireddy6]

one of the bestest lectures i have ever listened.. thank you very much

[@toluojo6141]

You are the best. Can't believe how much I've learned so far from you. Thanks a million

[@StewartLynch]

Happy to hear that!

[@samuelpatrickhenness]

Thanks Stewart, another really useful video. its great to finally understand how things I've been doing for a while actually work!

[@StewartLynch]

Glad it helped! That is exactly what I am trying to achieve with my videos. My rule now is to not use anything that I do not understand myself.

[@joshuashires]

Epic once again Stewart. I have read the documentation over and over about closures and struggled to grasp the “Why” but comparing them to how we would usually write functions really really helped. A great follow on to this video would be expanding on the “Why?”. Your explanation using the VStack example was a big “Ohhhh i get it” moment but it would be good to see more examples of why should we use closures with real world examples. The thing I find hard is looking at a problem and implementing closures because doing it with functions in the traditional way just makes more sense and I cant see the advantage to using closures. However your completion handlers video might help with implementation of closures. Keep up the good work! Thank you for your contribution.

[@davidspicer8053]

Certainly the absolute best video on closures i've ever seen!

[@StewartLynch]

Thanks for that David. Glad you liked it.

[@cristhianleon2228]

What a clear and detailed explanation, especially with the capturing values. Thanks!

[@baylorjaxton5199]

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[@judsonbrendan657]

@Baylor Jaxton instablaster =)

[@baylorjaxton5199]

@Judson Brendan Thanks so much for your reply. I found the site thru google and Im trying it out atm. I see it takes quite some time so I will get back to you later when my account password hopefully is recovered.

[@baylorjaxton5199]

@Judson Brendan it did the trick and I finally got access to my account again. Im so happy:D Thanks so much, you really help me out :D

[@judsonbrendan657]

@Baylor Jaxton no problem xD

[@semilife]

Thanks Stewart un-voodooing the Voodoo. Clear simple, concise.

[@StewartLynch]

Glad you found it helpful

[@headach09]

Lots of cases comparing !! Much thanks :)

[@jasurrajabov]

Tutorials are one of the best, with both high-quality video edit and the content itself very informative. Also love to see tutorials using closures with using weak, unowned. Thank you very much.

[@AchrafTrabelsiMobileDeveloper]

Thank your for this amazing video about closure, very helpful !

[@edwarmartinez228]

Thank you Stewart, you are Really a teacher

[@jaaviondavis9790]

Thank you so much! I was struggling to figure out the meaning, the syntax, the use cases of closures in swift. After watching the video I'm able to logically think it out as a code and not stray away from the context. Please upload more videos because the way you explain concepts and your thought process is impeccable. I will definitely subscribe.

[@StewartLynch]

I am approaching 150 videos now so I will continue. Enjoy.

[@jaaviondavis9790]

@@StewartLynch Do you have any videos explaining protocols and delegates?

[@StewartLynch]

I don’t think so. I seldom use them now with SwiftUI as there are alternate ways. I prefer to pass closures.

[@marcaupont9145]

Great job Stewart! Very thorough explanations!

[@StewartLynch]

Thanks Marc. This means a great deal coming from you,.

[@ribosome8085]

Steward is awesome 👏 thank you so much!

[@shadieossei4336]

Great job explaining! I'm beginning to understand closures a little bit.

[@3luizcunha]

Always incredible videos, thank you very much Stewart

[@StewartLynch]

Thanks

[@rolandolahmusic]

Fantastic explanation!

[@leneil46]

Wow this video helped me out so much! Thank you.

[@daniel_munoz_r]

Thank you very much for this video.

[@Simon-ro8nh]

What a great video! This is super helpful! Thank you Stewart!

[@DavidKoontz]

Thanks that was a great explanation.

[@abdulbasir8740]

Such an amazing tutorial, Thanks a Billion.

[@StewartLynch]

You're very welcome!

[@Александра-ш8ж1б]

I admire you! Thank you for such a detailed and simple explanation.

[@KimbrellBrad]

That @escaping example really made me understand what is happening in these cases! Never really go it until now. Thanks Stewart! Oh, I have to ask...who does your cover art for these videos? They are really entertaining and have a lot of thought behind them! Bravo! BTW, I think it is you, your significant other, or a good friend. This much detail would likely be expensive!)

[@StewartLynch]

I use a free app called Bitmoji Brad. Available on the App Store. You design your own avatar and then it provides you with hundreds of scenes that you can pick from. Anyone can do it. Other KZbin content providers use it as well.

[@shreesharao8308]

Best Explanation..It was helpful... Keep it up :)

[@kasunjayasekara3052]

Thank you very much finally I understand it correctly :)

[@StewartLynch]

Glad I could help

[@ravisaini8034]

Thank you so much sir.

[@lautarob]

Hello, enlighten videos! Thanks subscribed!!

[@ScottGrunwald]

Thanks for the great video

[@oneCrispy]

thank you.

[@drmucahiderdogan]

Great video.

[@Aightbruh02]

Please do a similar video about memory management and retain cycle

[@vamsi3877]

Wow superb 👏

[@doesntmatter6827]

Amazing!

[@1sudrap]

Very nice and comprehensible video which really helped me to get a good grasp of this topic, but just a small remark: Why do you say "Declare variable" and actually declare a constant. You did it at least twice in this video. But anyway great job.

[@StewartLynch]

Yah, I make that mistake all the time and interchange variable and constant. I try to catch and correct those things, but as you can see, I am not always successful. I have a tendency like many others to use variables when constants will do just fine. I script my videos before I record the video and then add the audio later after recording. As I am building the video, I realize that a constant will be just fine and then forget to edit my script when I am recording the audio. I will try harder next time to catch these things.

[@brandonwinston]

How does it work that your “PublicFunctions” function takes a ()->Void but then we toss a bunch of different types of closures at it that are not ()->Void?

[@StewartLynch]

Perhaps this will clear it up. We can create a function that itself contains whatever code we want, including other functions. func example1() { func sayHello() { print("Hello") } sayHello() } Notice that example1() has no parameters and returns nothing so it is of type () -> Void We can then use that public "code" function to pass in example1 as our sampleCode because it meets the requirement for our closure. code(for: "Another Example", sampleCode: example1) Now, because sampeCode is a trailing closure, it could be written like this: code(for: "Another Example" { example1() } So instead of defining example1 as a function, we can simply pass in the body like this. code(for: "Another Example") { func sayHello() { print("Hello") } sayHello() } Does that help?

[@brandonwinston]

@@StewartLynch yes thank you very much!

[@kenturnbull9679]

This one??? I see Completion handlers as well. KT

[@itchyminge]

Why do you call finallySayIt within the function, and then pass in a different function (closure) called reallySayIt? Could you not call finallySayIt within the sayHello function?

[@StewartLynch]

I am not sure I understand your question. Feel free to email me if you want to explore this further.

[@Sokrates8]

Strangely I can't download the Starter Files with the Chrome Browser; always have to switch to safari.

[@StewartLynch]

Sounds like a security issue. It is a Zip file so that could be your issue.

[@kenturnbull9679]

@@StewartLynch I regularly use Chrome, Canary, and Firefox Dev. I can download the starter files in ALL of them as well as unzipping them. In fact, I just checked all of them before I commented. In addition to the Closure info, I really enjoyed seeing what things can be done with Playground... but my spelling is starting to suffer :-)

[@nickapeed]

Great video here and your other work! I'm a new subscriber, thanks!! Question for anyone that can help me at 10:08 func sayHello(to name: String, finallySayIt: (String) -> ()) { what is the purpose of the "to" here?

[@StewartLynch]

It is simply there to make the function more readable at the call site. sayHello to “xxxxxx” instead of sayHello “xxxxxx”

[@mcquinmadtha]

"to" is the external parameter name, whereas "name" is the internal parameter name. So when passing a parameter, instead of saying sayHello name: "Sam", it would look like sayHello to "Sam", much more readable

[@mx.stoneheart]

@14:00 calling me TF out

[@StewartLynch]

I think we have all been there.

[@richoffks]

bruh, I wasted two hours finding out this code doesnt even work smh

[@StewartLynch]

Pardon me? What are you referring to? It would help if you could be more specific, because the code does indeed work in this video.

[@richoffks]

@@StewartLynch when I create the exact same functions as the one in the video, an error pops up because of the incorrect parameter name

[@StewartLynch]

DM me on Twitter @StewartLynch and share your code with me so I can see what you are doing wrong.

[@StewartLynch]

I also just downloaded the completed playground from the link provided and all of the code works fine, even in Xcode 13 beta so you must be doing something wrong in your implementation. I am more than happy to check your code.