Why null safety? | Session

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Hear from one of Null Safety's creators about how this fundamental new language feature impacts the experience of writing Dart code, prevents errors, and results in smaller, faster binaries.
Resources:
Null Safety in Dart → goo.gle/3vwR48B
Understanding null safety → goo.gle/3gLsVa1
Why Nullable Types? → goo.gle/3u3vJ67
Speaker(s): Bob Nystrom
Watch more:
Flutter at Google I/O 2021 Playlist → goo.gle/io21-Flutter
All Google I/O 2021 Technical Sessions → goo.gle/io21-technicalsessions
All Google I/O 2021 Sessions → goo.gle/io21-allsessions
Subscribe to Flutter! → goo.gle/FlutterYT
#GoogleIO #Flutter
product: Flutter - General; event: Google I/O 2021; fullname: Bob Nystrom; re_ty: Premiere;

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18 май 2021

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Комментарии : 75

@jdheeter 3 года назад

This man is great at explaining things

@thebirdhasbeencharged 3 года назад

You should read his books (Crafting Interpreters and Game Programming Patterns), walking wizard!

@philosophia5577 Год назад

I felt the same entire time. This video gave me a lot of topics to explore after which I will rewatch this video for greater understanding.

@StanislausMadueke 3 года назад

This is definitely my current favourite IO talk - just the right level of detail for such a complex topic. Great job, Bob! Hope to see more from you in future. ♥️ Dart and Flutter!

@awsumgeorge 3 года назад

+1; The speaker's profile badge is quite misleading, though. Bob does not look anything like that picture nowadays, and the chihuahua passed away since the picture was taken. (Check out Bob's books, btw. Good stuff; approachable and informative.)

@nicolalanzoni674 3 года назад

@@awsumgeorge Hey Jiri, what's the name of Bob's are you referring to? I'd like to take a look. Thanks

@awsumgeorge 3 года назад

@@nicolalanzoni674 They are "Game Programming Patterns" and "Crafting Interpreters". Both available to read for free at the book's websites.

@huthaifa5 3 года назад

When I listen to Bob Nystrom talk about Dart and Null Safety, it feels like listening to poetry. Not even sorry for how geeky that sounds. Amazing work guys, always happy for the constant improvements and changes you keep providing.

@SundiMyint 3 года назад

I have seriously never consumed more articulate code content on the internet. Thank you all for your hard work and putting time into making this content for us!

@pauek 3 года назад

I love that you decided to publicly talk about the complex decisions that went into implementing null safety, and not water it down. Thanks so much!! This can only strengthen our confidence in and attachment to Dart and Flutter.

@azrulihsan4085 3 года назад

Such a relief with null-safety features in dart. Been migrating my old projects and it felt like a heavy burden lifted from my head. Good job flutter team!

@roger58469 3 года назад

This was really great to watch, an excellent explanation. Thank you very much for the video and kudos to Bob Nystrom!

@jainam9805 3 года назад

i don't comment publicly often but damn this guy busted my brain with knowledge of language designing! Please start your own channel and disperse knowledge of dart

@dovas90 3 года назад

Great description and explanation! Thanks for the help. I love your team!

@LohenYumnam 3 года назад

Coming from Swift .. I love null safety.. awesome job guys ❤️❤️

@krishnateja4688 3 года назад

really ? the persons who came from swift won't like this cause this doesn't has if let or guard, which is crucial for type promotion.

@LohenYumnam 3 года назад

@@krishnateja4688 ya that part I miss a lot. I miss the power of enum, in swift too. Dart is not perfect but they are trying. It’s funny that if (x != null ) is the alternative of guard let or if let

@user-xm2yz5yy6l 3 года назад

@@krishnateja4688 Came from swift too. its just a litter bit more code . i will take it.

@huxpresso 3 года назад

I don't use Dart but I studied PL in school so I love the balance between being pedantic and being pragmatic during this talk ❤️ Definitely the best programming talk this IO so far!

@samgamer3530 3 года назад

Terrific presentation -- Bob, you are killing it

@Yous0147 3 года назад

Amazing video, great overview and very insightful discussion. Really enjoyed every minute.

@MichaelDuarte 3 года назад

This is awesome, thanks for the super easy to understand explanation of how this works and most importantly, why!

@peterhuijsen 3 года назад

Really well explained! Loved the talk.

@osamaali6603 3 года назад

Wow! This was an amazing talk. Poetic!

@nicoeg 3 года назад

Such a good explanation and really good talk!

@muneebmukhthar4880 3 года назад

Best I/O talk !

@Pablo_IF 3 года назад

Great video!! Many thanks!!

@dantedt3931 2 года назад

Great explanation. Flutter is the future!

@SaiyanJin85 2 года назад

That was great! It makes me think about my code in other languages.

@sthiag0 2 года назад

Wow. What a great great talk.

@nordern1 3 года назад

TIL: We use C because Pascal had static array sizes :P

@amitmohan7594 3 года назад

Awesome talk!

@bibitepower 3 года назад

Null Safety is awesome, you did a great job! 💪 I think we're all waiting for type unions and data class 😉

@sohelakhtar8044 3 года назад

Great talk❤️🇳🇵

@kousheralam 3 года назад

Nicely explain, love it 🤩

@idlevandal69 3 года назад

Great job!!!!!

@demondragon6198 3 года назад

it's informative !!

@evandrojunior7628 3 года назад

Amazing!

@richardjay1791 2 года назад

Sweet. Thanks

@SethuSenthil 3 года назад

I always wondered how the Dart engine checks null, this is crazy

@aminelahrim8142 3 года назад

Thank you for the informations I like null safety

@tananga1523 3 года назад

Love this videos ! Can you guys add support for Dart in Cloud Functions ? Is a shame to use node or python. That will be legendary !!!

@_chappie_ 3 года назад

Interesting. I've always thought the idea was to eliminate null values all together, unless absolutely necessary. Thanks for the insight.

@baraaaljabban9058 3 года назад

I read a lot of comments say : great talk (and really it is), but I don't know why I fell it's too heavy or it's so hard for me to understand it easily 😂 I'll get back to it agin to understand more. Anyway thank you for the explanation ❤️

@danielbarnett5764 3 года назад

Had to like this video. :-) Im new to Flutter/ Dart but is there an "undefined" value rather than null. I.e. not set vs actually null. Detecting something never set is a useful conditional test. Seems relevant to the example. Cheers great vid

@jrheisler 3 года назад

Flutter Web app, just migrated to null safety, it is noticeably faster, and the migration tool!!! Well done!

@krokenstiv8777 3 года назад

Supporting both dynamic and static typing is a very smart decision. Also I like that I can use Future as a coroutine or as a promise depending on the problem. But nullsafety is not important for me.

@dc5 3 года назад

What a great talk! Thank you, Bob! About fields and top-level having to use the bang... I still find it a little odd and not sure if it's good practice or not to do it that way. For example, that screen at 14:38 looks scary ... if (_positional != null) rules.add(_positional!); I have many of those around and just feels odd. So I wanted to know your opinion on whether that's ok or if there is a better, recommended way of handling those?

@pierre-louisguidez2040 3 года назад

This is expected for fields. The explanation and an alternative to using ! (copying to a local variable) are explained at dart.dev/null-safety/understanding-null-safety#working-with-nullable-fields

@dc5 3 года назад

@@pierre-louisguidez2040 thank you, that's what I've been doing... A mix of bangs and local variables.. just wanted to confirm it was good practice.. thank you!

@Neoclassicalmaese 2 года назад

This man claims in his books Crafting Interpreters that language designers are no dark arcane wizards. But he cannot fool me, is IS a dark arcane wizard. Thank you Bob for sharing your knowledge with the world!

@agung_laksana 3 года назад

Please provide optional casting ( as? ) like in Swift and Kotlin

@Kitulous 3 месяца назад

7:50 coudn't the outside code update the list? like in the first isNotEmpty call it had no elements, therefore border didn't get initialized, then some other code in between the two ifs added an element in there, and the second isNotEmpty succeeded, and we got an uninitialized border variable. List can be mutable, it's not some sort of read-only list.

@ruynobrega6918 3 года назад

One of the things that made me use less python was the dynamic type check/null check. It REALLY slows down apps. Typed languages are the best to read and write, and null safety improves both readability and performance. To be honest, I don't think there is any drawback here at all.

@ChrisC97232 3 года назад

I didn’t really understand a thing, but watching and listening to this guy, I was made to feel as if I mastered what null safety is from even the start of the video 😅 This dude is a master at presenting 🙌🏾

@adamcierniak3902 3 года назад

How to disasembly flutter program ? I mean how to extract lower levels of abstractions from dart to assembler?

@mobileappsdevware264 3 года назад

Hi man, i start to learn dart and flutter, i wonder why object in in flutter can't be mirrored or reflected, i need to list an object properties , in other words i need to make some thing like GSON Lib (android) and JsonDecoder(iOS). can we?!

@CleisonArenhart Год назад

It can be pretty painful migrate an old codebase to null-safety. I ran "dart migrate" and i've noticed that our code is not prepared for that. A lot of usages of maps as indexes which needs "!" operator, a lot of variables that needs to be late and the migration didn't recognize it, so made it as nullable ("?" operator). Now I'm looking for 466 files to check which one is right and which one is not. Basically, I'm re-doing everything. At least, de migration marked-up which file I have to look.

@harry356 2 года назад

Instead of a null error I just get unexpected behavior that takes a while to debug. If i get a nullpointer I immediately know what is wrong and where to fix it. Maybe I need to get used to it?

@siyabon_ga 3 года назад

Bob needs to explain all flutter/dart confusion related topics coz green light all of a sudden on my side.

@akhileshsuvarna8830 3 года назад

💙 from INDIA

@xXxBladeStormxXx 3 года назад

But what about null safety in Lox, Bob?

@m00ni 3 года назад

@obengkuning3260 3 года назад

Why?

@danvilela 3 года назад

300 IQ

@huthaifa5 3 года назад

IQ overflow*.

@Shakl-e 3 года назад

I am not afraid of null anymore

@gokhangorali5385 Год назад

Electrons? detected :))

@MyrKnof Год назад

contrary to everyone else, I hate this so much. As someone who just got told to upgrade a 5 year old app its all just: late late late late late !!!!!!!!!!!!!!!!!!!!! ??????????????????? and hope it works afterwards. I got no idea what I'm doing or how to fix anything. Perhaps im just too dumb and lazy to be a programmer. Everything worked fine before.

@justchecking2470 3 года назад

and then suddenly all tutorials from old versions crashed

@francisgeorge7639 3 года назад

Good presentation. But Google still need to be employing professional documentation writers and not engineers.

@m00ni 3 года назад

We do have two very excellent tech writers on the team. But we hear from many users that they appreciate learning directly from the engineers who work on parts of the system. (Also, I am an author too, so I guess technically I fit your criteria.)

@mortysmith666 3 года назад

After migrating to null safety, my app size became doubled

@francisgeorge7639 3 года назад

Delphi solved the Pascal string problem. It also had almost instant compile. And Oh my gosh it was so much simpler than Flutter. With Flutter we're almost back to 90% UI coding 10% business logic, which Delphi switched. Delphi died because Microsoft stole their lead developer, who went on to design c# and Typescript.