Kotlin Tutorial for Beginners: The Kotlin Programming Language Full 9-hour Kotlin Course

[@donnfelkeryt]

English subtitles have just been added. Enjoy!

[@donnfelkeryt]

@20B1054 thanks, but no need. I’m glad you’re enjoying the video ;)

[@rahulchowdhury279]

This was Great. Can you make such videos of other languages as well. Like Android studio, rxjava, git and so on.

[@MilindaAbeykoon]

Thank You. this is great Video ❤❤

[@amirsenator5358]

i love you man 😎

[@markusr1308]

Wow, why is this not on Udemy or on any of the other online learning programs? So tired of non-native speakers on Udemy

[@ReetaDevi-qt4ur]

i am 13yrs old and i am love with this course thank you so much for making such amazing course

[@robkremers]

I have just now finished the course and it's by far the most comprehensive course with regards to the Kotlin basics I have seen. Thanks Donn, for putting all the effort into making this course!

[@donnfelkeryt]

I'm glad you enjoyed it and found it valuable. :) Thanks for watching.

[@MojeedYakubu-nn9yi]

Thanks For the video, It's still amazing even after 3 years.

[@donnfelkeryt]

@@MojeedYakubu-nn9yi thank you

[@rohonhaque1154]

I have learned everything to get started with Kotlin and I am here to say Thank you..❤️❤️

[@donnfelkeryt]

I’m glad I was able to help!

[@nguyenminhrelex]

I come from Vietnam and i learned your kotlin, you teach very good. Thank you.

[@donnfelkeryt]

Glad to hear that

[@codekat153]

I'm two hours in and this is super helpful! Great pace and explanations. Thank you so much! It's amazing that this is available for free. I need to learn Kotlin for work and this is exactly what I was looking looking for. Thank you!

[@donnfelker8252]

Glad it is helping you!

[@danielxell]

Please can you help me...I can't find any run button for running the code. When I try to run from the menu bar it says I should edit configuration... Please I don't know what that is

[@osternosousa]

Just Finished! Really the best and most comprehensive. Best fun of the last 3 weeks of my life.

[@donnfelkeryt]

Thank you so much for the kind words! I’m glad you found this very useful. The best of luck to you in your future endeavors!

[@airilsra]

in the olden days we'd need to pay fortune to get this kind of course. thank you.

[@donnfelkeryt]

I'm glad you're enjoying it. Thank you for the comment.

[@Longlannhi]

I 've just finished the full course. Really appreciate your effort you put on this. Amazing!

[@donnfelkeryt]

I'm glad you found value in it. :)

[@samwise1688]

Wow! Such a high quality for a free course with subtitles! Just can't express what a great job you did!

[@donnfelkeryt]

Thank you for the great comment!

[@MuhammadSaheed-jb9mr]

😲Donn , The video was really amazing.😁 I'm really grateful to you for it. Someday your courses will really shine . Thanks for everything you have taught me

[@donnfelkeryt]

Thank you. I’m glad you’re enjoying the course. 🙂

[@Dibyendu.M]

Today, I completed this tutorial, and I must thank you for this amazing, in-depth video. I highly recommend it if you're new to Kotlin or want a refresher.

[@parulson6274]

My goodness! Just started, 17 mins and going...you explain like butter.. Thanks for making this tutorial for free. Take love

[@donnfelkeryt]

Glad you’re enjoying it

[@robertoliccardo]

Just finished the full course. This is amazing. Thank you for the effort you put in this!

[@donnfelkeryt]

That’s an amazing feat! Thank you, and a big congratulations goes to you! 👏🏻

[@neingtyyyy]

Been coding in kotlin for almost a year. Still coded along with the whole intro. Even learnt a thing or two. You sir are a hero.:)

[@donnfelkeryt]

Thank you! 🙏🏻

[@raypaxman9600]

So far having a great time, it's a very comprehendible course. I haven't finished it yet, but I'm treating it like an actual day to day hour to two hours lesson kind of thing.

[@donnfelkeryt]

I’m glad you’re enjoying it!

[@-----0-----]

06:40 filter on list is just "not wise" :) that's why it takes that much time. During that filtering elements are being added into ArrayList :) for (element in this) if (predicate(element)) destination.add(element)

[@DrewMyersUk]

Thanks for this, I made it all the way though 9 hours over about a week. I had genuinely forgotten what you looked like by the end of it; was strange to be reminded again at the end lol.

[@lou19]

Can't believe this video exist. Thank you so much.

[@romansinicyn8803]

Just finished the video. Was watching it in during breaks in-between Atomic Kotlin book. You're a great teacher and mentor, Donn! Thank you for sharing. Really glad that I found your KZbin channel)

[@donnfelkeryt]

Thank you so much for the kind words. I’m glad you enjoyed it!

[@theo-chidie-okoye]

Just finished ! Learnt a lot of new things, awesome explanations. Thanks

[@bosch5053]

My gratitude to you for all you have done, which I will never forget. I truly appreciate you and your time you spent helping me in learning kotlin .Thank you very much for the course. I enjoyed every minute of your lecture

[@donnfelkeryt]

Thank you for watching and I’m glad you enjoyed it!

[@amory027]

thnx man u r doing great

[@marcosnarvaez7154]

Pure gold!

[@donnfelkeryt]

Thank you

[@RagHelen]

13:20 If you get a type error, it means that Kotlin makes type checks for every variable at runtime. This is what makes Python so slow. The proper content for strings in an int variable should be the unicode number without errors.

[@ThePujjwal]

Thank you Donn. Took me some time but finally completed the 9 hrs tutorial. Looking forward for your video on co-routines.

[@donnfelkeryt]

Congrats on finishing it! Well done 👏🏻

[@佐藤あきら-i3m]

Thanks your kindness!! from JAPAN🎌🎌

[@donnfelkeryt]

Awesome, glad you like it!

[@strongthore2414]

Great video, have learnt more in 10 minutes than half a year in school

[@donnfelkeryt]

I’m glad you’re enjoying it 👌🏻

[@jimbothebimbo123]

Incredible tutorial, thank you so much! I appreciate you taking the time to answer people's queries on the individual videos as well.

[@donnfelkeryt]

Thanks for watching and for the comment.

[@muhammadrizo8630]

thank you very much for this course. this course was very helpful for me

[@donnfelkeryt]

Glad to hear that :)

[@ashokmanis2111]

I watched entire 9 hr it is really nice..Need more videos 😊

[@DevilsAreRed]

Thank you for sharing your knowledge to help beginners like myself learn. Highly looking forward to future videos.

[@donnfelkeryt]

Thanks!

[@pauliusvaitkevicius3708]

A very nice fundamentals course! I really liked how you explained the purpose of interfaces, the customer-menu-restaurant example is really genius :) Thank you!

[@donnfelkeryt]

I’m glad you enjoyed it!

[@tejaspatil8831]

Wonderful course indeed makes difficult concepts easy

[@bjugdbjk]

This course is really a DON type to get the fundamentals right at one place for kotlin !! tysm, Whenever I have some basic doubts I come here and search in ur content timestamps !! tht's it boom ..things cleared :)

[@donnfelkeryt]

Glad you like it

[@Lakozor]

[@alanc0x]

Awesome Donn, thank you so much for making this video! All the best ;)

[@maheshmurugan5527]

There is no video in utube like this video .. you are great Donn thanks for making this video.. I am started learning kotlin to develop android apps. If you have any idea on making video for android app development using kotlin and jetpack on kotlin pls do it quick as much possible bro bcoz your tutorial is awesome ..

[@donnfelkeryt]

Thank you soo much. I appreciate it. I’m glad you’re enjoying it

[@maheshmurugan5527]

@@donnfelkeryt can i able to use kotlin inside react native ?

[@alexanderruchkov7629]

It's worth mentioning, that when modifying fields of container class, inner classes instances have access to modified values.

[@major_cruze]

Thank you for the great video. Very easy and quick way to understand basics!

[@Sherimankind]

I love this superb tutorial. In your next video please increase the font of the IntelliJ idea to 25 so that we can boldly see those codes.

[@novianindy887]

1:41:53 in real world scenario, is that necessary ever (creating a method to assign value to properties) ? Can't it just be: user.firstName = "new Name" to change the properties?

[@donnfelkeryt]

Of course, you’d totally do what you recommended in your comment. I’m just setting up the example to show what’s possible and then I build on it later.

[@christosbazios52]

Detailed and excellent tutorial! Is there any extra video of the Kotiln tutorial?

[@ThePujjwal]

3:55:21 you mentioned that "by default classes are open". There are other tutorials on Kotlin which mentions that classes are by default final.

[@donnfelkeryt]

You are right. I mis-spoke. They are final.

[@TM-zk2hm]

Thank you very much, ecpecially for subtitles. I’m from Russia and it’s more easily to understand.

[@donnfelkeryt]

Glad you're finding it useful!

[@bahauddinchishte]

Take love from Bangladesh.

[@bouffeurdherbe4091]

I'm gonna start wathing and learning from you. I already subscribed and liked the video because im sure you deserve it.

[@jswaby]

Thanks for this video. It’s very thorough and a great reference. Have you considered adding chapters? That would help a lot. Thanks again!

[@donnfelkeryt]

Chapters have been added, but there are SOOOO many of them that the scrubber has a hard time with them. It used to show them all in the player, but now it doesnt. However, if you open the description, you can see the chapters linked to specific timestamps in there.

[@sushnag22]

Thanks for uploading!

[@donnfelkeryt]

You bet

[@Chintanparmar]

Thank you for uploading! Amazing course. It would be good if you also add the KZbin feature of showing chapter/section in Video.

[@donnfelkeryt]

The chapters are in the description with timestamp links. I think there are too many so KZbin is not putting them on the timeline. There’s over 136 chapters :) Open the description fully, find what you’re looking for and click the link and you’ll taken to that chapter. Cheers

[@wareesha3734]

thank you so much for this effort!!! ✨

[@imHasanRana]

Thank You So Much For This Amazing Course

[@donnfelkeryt]

I’m glad you’re enjoying it

[@enchylong2074]

Thanks for sharing this valuable course

[@ArjunSingh-qt5jn]

Thank you so much, so what should I learn next after this course video? :)

[@moneyharry]

So nice of you

[@donnfelkeryt]

Thanks for watching

[@muntasirmahmudsaif6239]

you have covered everything..Thanks for that

[@jilhenry]

Thank you so much. Just what I needed.

[@eloa30]

Really Thanks Donn , appreciated your great and nice tutorial you made.

[@donnfelkeryt]

You are very welcome

[@alansilveyra]

I finished it. Thanks!!

[@marty9404]

4:20 Tried creating a new Kotlin File/Class, but the option just didn't show up. Only option I got is Kotlin script. Please help. Am on my Windows 10.

[@henrychan1973]

Thanks for create that Amazing video !! I learn a lot. ( I leaen more than from my lecturer )

[@koyephillips]

I've started my android development journey today. I'm new to programming and only just getting started with mobile development. I hope I'll pull through the turbulence ahead. Till we meet at the end of this training, I'll keep my cool till I lose it.

[@donnfelkeryt]

You got this. Best of luck!

[@nasirfshah]

I just started the course , 🎉🎉🎉🎉 lets see how many days it will take to finish.

[@nasirfshah]

Whoa !!!!! , I finished the course today . Thanks Don for all the work that you put together , I appreciate it :)🤓

[@donnfelkeryt]

Awesome! Glad you liked it! Nice work Nasir

[@danyelsh874]

I'm from iran You're my hero Thanks 👍

[@donnfelkeryt]

Thank you 🙏🏻

[@diginthomas3482]

Great video 👏

[@donnfelkeryt]

Thank you

[@lestroisi951]

Thank you very much for this amazing course

[@donnfelkeryt]

Glad you like it

[@nicoladellino8124]

Nice tutorial, TNX 👍 👍 👍

[@melkieg3753]

Thank you for such a great content.

[@ВильданКрылов]

Hello, Donn! I have at this moment 6:05:53 an error appears here items.put("TX", "Texas") println(items). PUT highlights with a yellow wavy line. How to fix it.

[@wycliffeoloo6423]

I can't thank you enough. Thank you so much!

[@greggerwitz2668]

Hi Don, having learned programming back in the COBOL days, these modern languages are hard to grasp. You helped significantly. Thank you. BTW Boolean is pronounced Boo-lee-ann with the first syllable emphasized.

[@donnfelkeryt]

Greg, I'm glad you found some value in this and I'm super happy it helped!

[@SignalProduct-be2js]

2:24:02 - switching from 'class' to 'object' looks does not really substitute the actual 'Singletone' pattern.. 'object' - just puts a definition that all members\functions inside a class are static, and 'object' is not allowing to have inheritance... while actual 'Singletone' pattern with Singletone.getInstance() suggests that getInstance() can return a reference to abstract class\interface - where polymorphic behavior can be preserved (where Singletone.getInstance() can return various implementations).. while 'object', at the same time, cannot preserve polymorphic behavior (as 'object' is not allowing to have inheritance)

[@andyjagroom.3878]

Nice tutorial brother

[@donnfelkeryt]

Thanks!

[@cretik_shmurda]

10 minutes watched and am sure am on a right place. Welcome me to Android development everyone ❤️

[@donnfelkeryt]

Glad you're enjoying it!

[@rayhann9780]

I recommend for time stamp of topics.

[@kibettheophilus]

Quality content

[@donnfelkeryt]

Thanks!

[@karaokemaniac64]

Moves prettg fast, but great teacher! Thank you

[@tjkn8734]

Thank you so much! Is Intermediate Kotlin tutorials coming next?

[@donnfelkeryt]

I don’t have an eta for an intermediate or advanced course at this time. Thank you for asking though.

[@soumyadeepghosh4428]

Petition for a full Jetpack Compose course!!

[@nyamuknging3531]

You know, this is so gooooooooooooooooooooodddd

[@DmitriyMalayevProfile]

Hello Donn, thanks for making such a great video. Question. When I run println(fullName::class) in the output I get class java.lang.String (Kotlin reflection is not available) instead of Kotlin String

[@RodrigoCericatto]

Hey Donn, how you did that at 2:52:59?

[@donnfelkeryt]

IntelliJ Multiple Cursor Selection: www.jetbrains.com/webstorm/guide/tips/multi-cursor/ it’s a WebStorm link but the key bindings should be the same on IntelliJ

[@alansilveyra]

Hi Donn. I believe the map function any() is the same as isNotEmpty() and none() is the same as isEmpty(), right?

[@pierrecarol9964]

I really love your teach

[@donnfelkeryt]

Glad you’re enjoying it

[@tipstarseries6081]

starting today hopefully it might take three days woooo

[@alekasandarmilosavljevic6767]

Oh man this is looks lot like Swift. Great for me :D

[@chromiumCR24]

Thank you so much

[@lasvegasbaby1645]

Thank you.👍

[@bjugdbjk]

Hi, coul dyou tell what ide plugin are you using , I mean automatically what type of the variables is getting shown in the grey text, I have seen something for the same for rust as rust analyzer !!

[@ecomadvisor.]

Should I start learning to your vedio.

[@omkarnaik6305]

Hi Donn, @6:16:40, when I type Map.Entry eclipse shows 'Reference not found' error. Have you separately implemented the Entry interface that you've not shown us in the video?

[@donnfelkeryt]

It is possible I already had the include at the top of the file. If you get a red squiggly line under it, put your cursor on it and hit ALT+Enter to see if it offers to import it for you. :)

[@Dibyendu.M]

Thank you

[@donnfelkeryt]

You bet!

[@abdullahkardas8887]

capitalize and decapitalize depreciated, uppercase and lowercase could be used

[@rosinant]

So far so good.. Thank you very much for knowledge sharing. I have one question.. does Kotlin classes have getters and setters like Java? I am 2 hours in this lessons, sorry for asking if it is explained later.

[@rosinant]

Mh,, ok i got it,, every variable is an object (with getters and setters within) so it saves us time..

[@donnfelkeryt]

@@rosinant exactly. You can also overrride the getters and setters. Look at the description in the video, there is chapter marks you can click on to go directly to those sections. 👌🏻

[@djamelzitouni950]

Thanks. I did not get the difference between calling the variable name and using the $ sign?

[@donnfelkeryt]

The $ sign is only used when in string interpolation like this "My Name is $firstName" and this would out put "My name is Donn" if the firstName variable was "Donn"

[@djamelzitouni950]

@@donnfelkeryt Thanks I get it now lol.

[@balajikrishnan8379]

nice tutorials sir

[@donnfelkeryt]

Thank you

[@swapnilpadaya163]

200th comment ! Thanks for this course!

[@donnfelkeryt]

Thanks for watching!

[@osazeowie9792]

When does one use android studio?

[@shockearth4295]

Thank you for making this course. However I’m stuck at the very beginning I can’t test run my code because I keep getting an error message saying “Class configuration not defined” I’m using IntelliJ 2021.3 for Windows. Also when you go into the SRC folder in my version it allows me to create a new script however not a new class. I’m using SDK 1.8 JVM and I’ve fine tuned some settings using other KZbin tutorials. Would it be possible you would be willing to walk me through how to fix this issue via zoom for 5 minutes?

[@davidsiwarski]

I know this comment is about a month old, but I had the same issue when I was first starting. Small things like this can be super frustrating for beginners. You have to go to File > Project Structure and then select the src folder using right click and mark it as “Sources”. For some reason the src folder that is generated when starting a new project isn't recognized by default.

[@donnfelkeryt]

@@davidsiwarski Thanks for adding this comment David! I appreciate it!

[@oxxxyz]

@@davidsiwarski Now 8 months old comment and it helped me. Thanks a lot man!