Flutter Null Safety (!, ?, ??, late, ...)

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Learn everything about Flutter Null Safety & Dart Null Safety.
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TIMELINE
0:00 1. ? Question Mark (Null Safety)
0:29 2. ?? (Null Safety)
0:45 3. ??= (Null Safety)
1:03 4. ...? (Null Safety)
1:24 5. ? and ! (Null Safety)
2:35 6. late keyword (Null Safety)
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Пікірлер: 81

@HeyFlutter 2 жыл бұрын

This might help you :) 👉 12 Week Flutter Training from Newbie to Expert: heyflutter.com Source Code: github.com/JohannesMilke/null_safety_all Flexible Widget Tutorial: kzfaq.info/get/bejne/a7qndbt9v8q6pp8.html Expanded Widget Tutorial: kzfaq.info/get/bejne/hJd2gLtl16rSZo0.html Spacer Widget Tutorial: kzfaq.info/get/bejne/pJqUfbmGydCYmZ8.html FittedBox Widget Tutorial: kzfaq.info/get/bejne/jdaEgLFy19S8lJc.html Flutter Layout Basics Tutorial: kzfaq.info/get/bejne/r7-oqMiFs6-onHU.html Row Layout Basics Tutorial: kzfaq.info/get/bejne/or9letd_0NzdmIE.html Column Layout Basics Tutorial: kzfaq.info/get/bejne/pL1po6SqqdmRp3k.html

@leoMC4384 2 жыл бұрын

Great content as always. Like 2 weeks ago I had to migrate this old project I had to null safety and update all its dependencies. I did it manually. It drove me nuts. This guide would've made things much easier.

@bhabhayt398 2 жыл бұрын

building list with complex very json data in flutter implement in ui

@naveenjoshi7700 2 жыл бұрын

Same question

@KapilSharma-ul4ev 2 жыл бұрын

How to implement a complex nested JSON object in ui flutter

@Aushadhaya8158 2 жыл бұрын

Same to same my question please explain properly

@Aushadhaya8158 2 жыл бұрын

This question is very important because I have to give project for 3 days and I am not able to implement nested API.

@devrajheropanti6847 2 жыл бұрын

My is same

@LuisOtavioZimmermann 2 жыл бұрын

The best video about it. Straight to the point.

@HabiasaDeveloper 2 жыл бұрын

There's always something that you don't know. For example, I am a flutter intermediate. But ...? was new for me. Thank you for the tutorial. Really enjoyed to watch those smooth animations.

@TarrenHassman 2 жыл бұрын

Absolutely incredibly useful information in a beautifully concise way. Love your work

@HeyFlutter 2 жыл бұрын

Thanks, Tȟaŋháŋši Tȟáŋkamatȟó! 🙂

@WILFREDTSIKAH 2 жыл бұрын

Been looking to understand the difference. Thank you very much 🙏

@mikazora423 2 жыл бұрын

Best null safety guide ever,, nice work 🔥🔥

@realislam8153 Жыл бұрын

I must say that One of the best informative video on your channel ever Thanks for sharing this great useful information with us

@HeyFlutter Жыл бұрын

Glad you liked it, @realislam8153 😀

@88billizzard88 2 жыл бұрын

Very understadable! Thanks

@mayur16 2 жыл бұрын

Keep going.. very informative content..

@learning1online156 2 жыл бұрын

was very helpful to me, thank you!

@barziyassin1 Жыл бұрын

I really love your short and unique explanations, keep going bro

@HeyFlutter Жыл бұрын

Glad you liked it, Barzy Yasin 😀

@ashupathak9522 2 жыл бұрын

Thanks for listening my demand ❤️ Best flutter teacher 🔥

@ashfaqkayes5222 Жыл бұрын

Made my day bro. This operator (!) with nullable var was a headache for me.

@HeyFlutter Жыл бұрын

You are welcome, @ashfaqkayes5222 😊

@tishansaha5431 2 жыл бұрын

wow nice explanation :) thnx a lot

@pranaychakraborty4866 2 жыл бұрын

As always, best explanation ever

@alanhartmann3355 2 жыл бұрын

Nice work, thanks!

@ChrisHalden007 2 жыл бұрын

Great video. Thanks

@KrishNamaste Жыл бұрын

what an amazing explanation, kudos!

@HeyFlutter Жыл бұрын

Thank you, Krishna Gupta! 🙂

@peterbk364 2 жыл бұрын

That voice sir.... :) thankyou sir for this informational video... :) LOved it

@mohammedtouati8479 Жыл бұрын

Wonderful content as i expect, keep going.

@HeyFlutter Жыл бұрын

Glad you liked it, @mohammedtouati8479 😀

@AdilRangila 2 жыл бұрын

Greatly explained

@parameshmamidisetti8167 2 жыл бұрын

I need 30 minutes video on null safety ,deep explanation

@crazy-man 2 жыл бұрын

clear presentation, I just wanted to know more about null safety

@neliquidmusic 2 жыл бұрын

Nice! Thanks!

@danqiu6413 6 ай бұрын

Very good lesson! Thanks!

@HeyFlutter 6 ай бұрын

You’re most welcome, @danqiu6413! 🙂

@muniralmeslaty9602 2 жыл бұрын

Very very Good video Thank you u explain how to solve null safety problems

@muniralmeslaty9602 2 жыл бұрын

@@HeyFlutter I am waiting another videos from u

@someshsahu4638 Жыл бұрын

nice explanation sir thankyou

@HeyFlutter Жыл бұрын

You are welcome, Somesh Sahu!

@nurola 2 жыл бұрын

Your channel is like stackoverflow when I stuck somewhere while coding :) Get your recipe pill just before start.

@HeyFlutter 2 жыл бұрын

Great, Thank You VelociRaptor

@alexmaina3328 2 жыл бұрын

My flutter teacher

@sardortukhtamurodov1138 2 жыл бұрын

Could you make a video lesson on Dynamic Links please...

@akashhirusha3925 2 жыл бұрын

Can you explain how to convert previous version of project to null safety

@eek9313 2 жыл бұрын

Excuse me sir! I'm learning so much from your tutorials 😃 and while learning I got a problem that i created drawer and button NavBar for my app but when i opened drawer ,NavBar came infront of the drawer...How can i fix it. Please help me as possible !

@eek9313 2 жыл бұрын

@@HeyFlutter Sorry Sir but I can't get it😞 ! Could you please make a video tutorial on it ,tough cause I see many people have got the same problem. It would be really useful for beginners like me. ❤️

@HeyFlutter 2 жыл бұрын

Thank You Ⓖeek! Follow this link: stackoverflow.com/questions/63882656/flutter-drawer-overlaps-the-bottom-navigation-bar I hope you will get your answer 🙂

@rajgathiyawala6302 2 жыл бұрын

i clicked on container then container size will be increased from bottom and where size will increase I want to add text on that space....... which widget use for this??

@user-jj3ld6kk2u Жыл бұрын

Thank you

@HeyFlutter Жыл бұрын

You are welcome, @user-jj3ld6kk2u!

@ZOZA468 2 жыл бұрын

nice intro

@devrajheropanti6847 2 жыл бұрын

json data in flutter how to implement

@uzairahmad5086 2 жыл бұрын

Hi Sir Please Make a video on how to request Location Permission on run time i am getting location but for that i have to allow location manually in settings of app Kindly make a video on permission Dialog Box Thanks

@uzairahmad5086 2 жыл бұрын

@@HeyFlutter sir please make next video on this topic. I've requested this video in last month

@rishi2220 2 жыл бұрын

🔥

@goldenlife6166 2 жыл бұрын

Cool

@jorgeandresdiaz0 2 жыл бұрын

When is late initializer needed? It seems like a keyword that leads to bugs

@soultouchin 2 жыл бұрын

Hahaha 😅

@leoMC4384 2 жыл бұрын

In a stateful widget with a dynamic value that is assigned to another variable in the initState statement. In order to use that variable in the widget, you need to initialize it outside the initState and that's where I use "late". ☺️

@HeyFlutter 2 жыл бұрын

Thank you, Jorge Andrés! 🙂. Use late when you strongly convinced that first time you use late field it will be initialized

@coder551 2 жыл бұрын

Bro how Can I Paste any File In Particular device storage data path Using button In Flutter ? Can you Tell Something About It?

@HeyFlutter 2 жыл бұрын

Thank You Coder! Follow this link: medium.com/kick-start-fluttering/saving-data-to-local-storage-in-flutter-e20d973d88fa I hope you will get your answer 🙂

@sergey_molchanovsky 2 жыл бұрын

I didn't know about ?... operator.

@radovankljestan8793 2 жыл бұрын

Nice like always, can we expect soon something about dapps with flutter? Maybe on Ethereum network or others...Thank you for amazing content :)

@gataka534 2 жыл бұрын

Please activate the subtitles in different languages

@m.2.3 2 жыл бұрын

Error: The operator '[]' isn't defined for the class 'Object'. - 'Object' is from 'dart:core'. Try correcting the operator to an existing operator, or defining a '[]' operator. final data = snapshot.data!["data"] as List; Can you solve the problem?

@HeyFlutter 2 жыл бұрын

Thank You محمود علي حسين! Follow this link: stackoverflow.com/questions/60245865/the-operator-isnt-defined-for-the-class-object-dart I hope you will get your answer 🙂