for me too, right to the point, easy for beginners to understand. some other instructors shoot more times than this, and at the end i was still confusing, can't wait to hear Mr.allen talk about closure and its related stuff, read from lots of youtuber still confuse me
Great explanation of 3 concepts I’ve been avoiding for over a year. I now understand what they are for and am not afraid of them. I do wish though, that you had spent a minute showing us how to use them with the structure that appears when you hit “enter” on the placeholders - as well as how and why the method you used was equivalent. People do something similar with “where” clauses - and also don’t explain how or why it’s equivalent to ignore the Apple documentation and replace with a much easier to read closure.
Thanks for the note... I'll keep that in mind next time. But truthfully, when I learned, I learned the shorthand closure syntax... so that's pretty much the only way I've ever used them.
This isn’t very useful in any q&a stuff, but VERY useful in coding problems. If you can just whip this out without having to make a loop on a whiteboard, you’ll save minutes at a time, and really impress the interviewer
Sean great tutorial once again but you did not tell us why you get this "lldb_expr" when you print out your answer at 2:12. Would appreciate an answer!
It has to do with Swift Playgrounds and empty classes. I actually wasn't sure myself, so I had to look it up real quick. Rather than type out the long answer here, you can check read more about it here: stackoverflow.com/questions/31020725/what-is-lldb-expr-in-swift-playground
these videos are so awesome man I'm trying to learn on treehouse and sometimes how they explain concepts just doesn't resonate with me but these videos make it all much easier to digest
Very helpful higher level functional programming enhancements of Swift, map reduce and filter are very helpful to write elegant code. Applied on top of sequences such as Arrays and collections gives us developer so much power to write clear and concise code
Again a great video Sean. Many thanks. Have just implemented this in my project as I have a collection view scrolling horizontally in a tableView which I use to filter the data in the tableView dataSource
Awesome video, Sean! Glad I subscribed to your channel, because you go over all the small parts of the Swift programming language in a very clear and concise manner. You and Brian make a very good team :-)
There are two other higher order functions that are similar but kind of confusing. They are Flat Map and CompactMap. Are you planning a video for these??
Is return statement really needed ? Code below works fine let someNums = [3, 1, 6] let filteredNums = someNums.filter({$0 > 2}) print(filteredNums) //[3, 6]
To not have gibberish in the output it's nice to conform to CustomStringConvertible protocol and add description property to the object. struct Device : CustomStringConvertible { var type: String var price: Float var color: String var description: String { return "Type: \(type), Price: \(price), Color: \(color)" } } Print statement will be much cleaner 😀 [Type: iPhone, Price: 799.0, Color: White, Type: iPhone, Price: 699.0, Color: Black]
Hey Sean, I follow your videos to make my code robust and reach to standard. Can you please make a video to clarify the difference between Array and Set.
Because it was just simple data. But to be honest, there's really no thoughtful reason behind it. I just needed an object to work with real quick for the Filter, Map, Reduce examples. That was the focus of the video.
Sean Allen I'm a student I don't have much knowledge about the technology in market. I'm doing iOS development with swift from past 2years . But some of my friends are shifting towards React-Native . I love swift I don't want to move to React . What you think about future safety with swift .
+sachin yadav I can only speak for the U.S. market. Your country may be different. But in Silicon Valley, you're perfectly fine focusing on iOS development (Swift). There's a time and place for React Native, for sure, but ultimately I believe native is the way to go. I also got asked this question during my latest livestream, and I talk about it more there. Check it out.
Can someone explain to me, please, why Xcode completion for reduce() is a loooong gibberish, and in practice it’s just parameter and operator? Is there a nuance reason for long gibberish proposal that Xcode give? I’m really curious.
hey Sean i found this website is so useful for beginner, www.techotopia.com/index.php/Working_with_Array_and_Dictionary_Collections_in_Swift so can you share the stuff where you learned or could you make a video about how did you learned Swift programming or if you already done it then plz send a link :)
Hey Abdou, glad you enjoyed the video. I've started on some iOS 11 videos, not sure if you've seen them. But you can check out my WWDC playlist. It as my Keynote Reaction Video, Swift 4, Xcode 9, ARKit, and new Navbars in iOS 11. ua-cam.com/play/PL8seg1JPkqgGJn85LB3UJDpOwQ-FAFhuJ.html
I have seen them all and I thank you for that. I hope that you put the light on more profound concepts, notably the networking, what's new in Foundation ... Thanks
Ah, I got ya. Thanks for the recommendations. I have a VERY long video idea list and there's only so much time. However, when people request specific topics, I bump them up the list a little bit. I've heard the "What's New in Networking" is a good WWDC session to watch, but I haven't gotten around to seeing it yet. Maybe I'll do that tonight.
I saw both sessions (Networking 1 & Networking 2). Life becomes easier with the improvements introduced but I wish to see them in a concrete example. Thank you
Not a stupid question at all :). This depends on which course you are referring too as 2 of them were created in iOS 13 and the SwiftUI ones were created in iOS 14. That being said, I'm working on an iOS 15 update for ALL of them which will be released at the beginning of October (it will be a free update for those that already own the courses).
Hi Shean. I just found your channel. Its great. I have a question about map. its an example from Swift on Sundays book but i cant seem to figure out how to do this. I have a loop and i want to rewite it ising map The problem is i get an emty Array of objects: var timeZones = [TimeZone]() var selectedTimeZone = 0 let identifiers = TimeZone.knownTimeZoneIdentifiers for identifier in identifiers { if let timeZone = TimeZone(identifier:identifier) { timeZones.append(timeZone) } } print(timeZones) let identifier2 = timeZones.map({return timeZones.append($0)}) print (identifier2)
Awesome, congratulations for hitting 1000 subs mark already ! Hopefully you get patreon as soon as possible, so i can really appreciate everything you are doing! Are you planing on doing some closures explanation aswell ? :)
+iPHYZLL , Thanks for the congrats, iPHYZLL. You were one of the first few subs. It's funny you mentioned Patreon, because I've been planning it out the past week or so. Just need to actually create the page and get it up and running. Closures are on the "to-do" list but admittedly, pretty low on the list. Soooo many videos, so little time, lol.
Hey iPHYZLL, just launched the Patreon page here: www.patreon.com/seanallen. It sounds like you're familiar with Patreon, so I'd love to hear if you have any feedback. (On things like goals, rewards, etc...)
can Map go through a Post array, there is a type in each Post object called timestamp(when user create his post), and only take objects that its timestamp is within 7 days? i think it may require one extra step (if condition )to do to it. anyone got any idea? thanks
Watch Next - iOS Take Home Project - Job Interview Practice - Free Preview - ua-cam.com/video/MSIe2y6Fee8/v-deo.html
This channel is providing so much value to aspiring iOS developers like me. Thanks so much and keep up the great work!
Thanks Pranav! Glad you're enjoying it. More videos on the way!
For me too
for me too, right to the point, easy for beginners to understand. some other instructors shoot more times than this, and at the end i was still confusing, can't wait to hear Mr.allen talk about closure and its related stuff, read from lots of youtuber still confuse me
Great explanation of 3 concepts I’ve been avoiding for over a year. I now understand what they are for and am not afraid of them.
I do wish though, that you had spent a minute showing us how to use them with the structure that appears when you hit “enter” on the placeholders - as well as how and why the method you used was equivalent. People do something similar with “where” clauses - and also don’t explain how or why it’s equivalent to ignore the Apple documentation and replace with a much easier to read closure.
Thanks for the note... I'll keep that in mind next time. But truthfully, when I learned, I learned the shorthand closure syntax... so that's pretty much the only way I've ever used them.
Great stuff! Thanks, Sean. Had this on my "Watch later" list for a while and am finally catching up! I can use this info in my current project.
Thanks Mark! Must have been in there for a while, lol.
This isn’t very useful in any q&a stuff, but VERY useful in coding problems. If you can just whip this out without having to make a loop on a whiteboard, you’ll save minutes at a time, and really impress the interviewer
great work sean !! I was looking on the internet for reduce in swift, but your method of explaining is so great. Keep up the good work!!
Glad you enjoyed it, Meet!
Wow, the gist of these topics is explained so much easier. I started reading the Map chapter of a textbook and my brain wanted to 🤯 .
Sean great tutorial once again but you did not tell us why you get this "lldb_expr" when you print out your answer at 2:12.
Would appreciate an answer!
It has to do with Swift Playgrounds and empty classes. I actually wasn't sure myself, so I had to look it up real quick. Rather than type out the long answer here, you can check read more about it here: stackoverflow.com/questions/31020725/what-is-lldb-expr-in-swift-playground
Have any questions about Filter, Map, Reduce in Swift? Leave a comment, and I'm happy to help!
No questions. Just gotta say thanks for the reduce function tip ^_^
+Mike Pujol You're welcome!
these videos are so awesome man I'm trying to learn on treehouse and sometimes how they explain concepts just doesn't resonate with me but these videos make it all much easier to digest
That's great to hear, Conor. Happy to hear the videos are helping!
Nicely explained..👌
I was confusing in Map, Reduce & Filter so again watched the video and everything is revised now..Thank you..🙏
Glad it was helpful, Akshay!
Very helpful higher level functional programming enhancements of Swift, map reduce and filter are very helpful to write elegant code. Applied on top of sequences such as Arrays and collections gives us developer so much power to write clear and concise code
Oh Wow! This cleared up cloud of smoke over my head. Very nicely explained. Thanks a lot Sean.
Happy to help!
Again a great video Sean. Many thanks. Have just implemented this in my project as I have a collection view scrolling horizontally in a tableView which I use to filter the data in the tableView dataSource
Glad you enjoyed it, David!
Thanks for video .
The video is excellent , audio is great and you can show with the both ways .
Congratulations for your work.
Glad you enjoyed it, Marcos!
Hi Sean
I love your video,
your video help me understand lots of concepts. Thank you for providing us great tutorial
Thanks Pawan. Glad you liked it!
Great work! I am an aspiring web/iOS developer but as yet no job. Can't decide on which path to take.
I vote iOS... but I'm partial 😎
Awesome video, Sean! Glad I subscribed to your channel, because you go over all the small parts of the Swift programming language in a very clear and concise manner. You and Brian make a very good team :-)
Thanks for the kind words, Dennis! Glad you are enjoying the channel!
thanks for this awesome videos Sean, maybe something about JSON parsing in the future?
Thanks Miko! That video has been on my todo list for a while now. I'll get there soon... got a lot of video ideas.
thank you Sean :) i couldnt understand reduce from swift docs :) now i'm on fire :)
Happy to help clear that up for ya 😀
this is so amazing never knew this stuff and very clear explanation... i am seeing this old video n i believe with time you are going to nail it (Y)
Thanks for the kind words, Ammad! Happy the video help you.
There are two other higher order functions that are similar but kind of confusing. They are Flat Map and CompactMap. Are you planning a video for these??
Is return statement really needed ? Code below works fine
let someNums = [3, 1, 6]
let filteredNums = someNums.filter({$0 > 2})
print(filteredNums) //[3, 6]
You explained it very well.Thanks
Happy to help!
Your channel is wonderful !! :) Could you please create a tutorial on AlamoFire? It seems to be a lot in use by companies. Thanks
Glad you are enjoying it, Bidisha! I have an alamofire tutorial on my to-do list. It's just a VERY long list.
Hey Sean, your tutorials are really helpful. I'd like to know in this example how would you sort the myDevices array based on prices?
To not have gibberish in the output it's nice to conform to CustomStringConvertible protocol and add description property to the object.
struct Device : CustomStringConvertible {
var type: String
var price: Float
var color: String
var description: String {
return "Type: \(type), Price: \(price), Color: \(color)"
}
}
Print statement will be much cleaner 😀
[Type: iPhone, Price: 799.0, Color: White, Type: iPhone, Price: 699.0, Color: Black]
Thanks for the tip, Piotr!
Hey Sean, I follow your videos to make my code robust and reach to standard. Can you please make a video to clarify the difference between Array and Set.
Great tutorial Sean..thank you.
Glad you enjoyed it, Subin!
Why did you use a struct instead of class for this example?
Because it was just simple data. But to be honest, there's really no thoughtful reason behind it. I just needed an object to work with real quick for the Filter, Map, Reduce examples. That was the focus of the video.
Thank you for this video!
4:16 How did you do that
Commenting out multiple lines of code? Just highlight the lines you want to comment out, and then hit Command + /
Another great tutorial 👍
Awesome videos, Sean! Glad I subscribed to your channel, because you go over all the small parts of the Swift along with source code (~~
Thanks for the kind words, Ram 👍
That's really amazing video. Thx for sharing your knowledge with us
Thanks Sachin! Glad you enjoyed the video. More on the way!
Sean Allen I'm a student I don't have much knowledge about the technology in market.
I'm doing iOS development with swift from past 2years .
But some of my friends are shifting towards React-Native . I love swift I don't want to move to React . What you think about future safety with swift .
+sachin yadav I can only speak for the U.S. market. Your country may be different. But in Silicon Valley, you're perfectly fine focusing on iOS development (Swift). There's a time and place for React Native, for sure, but ultimately I believe native is the way to go. I also got asked this question during my latest livestream, and I talk about it more there. Check it out.
Keep Going Sean Allen, Need more like this...
Could you have a video on enum, tuple, sets. their pros and cons
ThanXs in Adv (Y)
Thanks for the kind words, Ghouse! I actually just added an enum video to my list today. Coming soon!
Thanks Sean. Great videos, like the content. Just a little remark there.
Thanks for the kind remark, Artur
Can someone explain to me, please, why Xcode completion for reduce() is a loooong gibberish, and in practice it’s just parameter and operator? Is there a nuance reason for long gibberish proposal that Xcode give? I’m really curious.
congratulations for 1k
Thanks Dilip! I appreciate the support. It's been a fun ride so far. More to come!
hey Sean i found this website is so useful for beginner,
www.techotopia.com/index.php/Working_with_Array_and_Dictionary_Collections_in_Swift
so can you share the stuff where you learned or could you make a video about how did you learned Swift programming or if you already done it then plz send a link :)
I did a video that might help out about how I would learn Swift differently if I have to do it over again. ua-cam.com/video/wb6-liariF4/v-deo.html
Thank you for the superb work and effort. I hope that you make videos about what's new in iOS11.
Hey Abdou, glad you enjoyed the video. I've started on some iOS 11 videos, not sure if you've seen them. But you can check out my WWDC playlist. It as my Keynote Reaction Video, Swift 4, Xcode 9, ARKit, and new Navbars in iOS 11. ua-cam.com/play/PL8seg1JPkqgGJn85LB3UJDpOwQ-FAFhuJ.html
I have seen them all and I thank you for that. I hope that you put the light on more profound concepts, notably the networking, what's new in Foundation ... Thanks
Ah, I got ya. Thanks for the recommendations. I have a VERY long video idea list and there's only so much time. However, when people request specific topics, I bump them up the list a little bit. I've heard the "What's New in Networking" is a good WWDC session to watch, but I haven't gotten around to seeing it yet. Maybe I'll do that tonight.
I saw both sessions (Networking 1 & Networking 2). Life becomes easier with the improvements introduced but I wish to see them in a concrete example. Thank you
Very helpful... Thanks
Glad you liked it!
Thank you so much!!! 🔥👍
Happy to help!
hey Sean, is your course up to date? sorry if its a stupid question :)
Not a stupid question at all :). This depends on which course you are referring too as 2 of them were created in iOS 13 and the SwiftUI ones were created in iOS 14. That being said, I'm working on an iOS 15 update for ALL of them which will be released at the beginning of October (it will be a free update for those that already own the courses).
@@seanallen Launchpad and fundamentals , thank you for your quick reply
Hi Shean. I just found your channel. Its great. I have a question about map. its an example from Swift on Sundays book but i cant seem to figure out how to do this.
I have a loop and i want to rewite it ising map
The problem is i get an emty Array of objects:
var timeZones = [TimeZone]()
var selectedTimeZone = 0
let identifiers = TimeZone.knownTimeZoneIdentifiers
for identifier in identifiers {
if let timeZone = TimeZone(identifier:identifier) {
timeZones.append(timeZone)
}
}
print(timeZones)
let identifier2 = timeZones.map({return timeZones.append($0)})
print (identifier2)
Awesome, congratulations for hitting 1000 subs mark already ! Hopefully you get patreon as soon as possible, so i can really appreciate everything you are doing! Are you planing on doing some closures explanation aswell ? :)
+iPHYZLL , Thanks for the congrats, iPHYZLL. You were one of the first few subs. It's funny you mentioned Patreon, because I've been planning it out the past week or so. Just need to actually create the page and get it up and running. Closures are on the "to-do" list but admittedly, pretty low on the list. Soooo many videos, so little time, lol.
Better later than never, can't wait :) Thank you for patreon update aswell. Have a nice day Sean!
Ya, could we have a closure explanation as well??
Maybe I'll move the video up the list a bit since it's being requested :)
Hey iPHYZLL, just launched the Patreon page here: www.patreon.com/seanallen. It sounds like you're familiar with Patreon, so I'd love to hear if you have any feedback. (On things like goals, rewards, etc...)
Thank you ! you are the man !
I appreciate that, Med!
Where the hell did the 1K subs come from?! Well done man
+Daniel haha, thanks Daniel. My WWDC videos about Swift 4 and Xcode 9 are ranking pretty well for me.
Awesome channel 👍🏻❤️
Thanks! I appreciate the kind words!
can Map go through a Post array, there is a type in each Post object called timestamp(when user create his post), and only take objects that its timestamp is within 7 days? i think it may require one extra step (if condition )to do to it. anyone got any idea? thanks
gave it a thumbs up.. 👍
Awesome, Bibin! Glad you enjoyed it!
Excellent.
Glad you enjoyed it Satham!
can u help me, please?
the best man ;)
Thanks Mohamed!
Talk to me man, i will be more than happy
你胡子哪😁😁😁😁