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

How to use ?, !, ??, late with Null Safety in Flutter / Dart.

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TIMELINE
0:00 1. ? Question Mark
0:18 2. ! Exclamation Mark
0:51 3. ?? Default Value
1:09 4. late keyword

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[husseinnasibu]

You always do a great job milke you are my favorite flutter YouTube instructor, it's short clean and fully comprehensive thanks you very much for your dedication....

[vTailsFPS]

This is amazing! so simple but explains it so well! You just saved me loads of reading and research! Thank you

[shribalaji]

You're so amazingly explained. And saved a lot of time and moreover I love your voice it's so good and pampering!. Ur so amazing dude.

[youtubeflight]

Whoa this short video was super helpful and full of core compact information!!

[programingtales]

I love the way that you explane the subjects in flutter
awesome! you are the best ❤

[Klausi-uqxq]

Nice! was a hard work to convert mostly everything of our apps to null safety.. but im feel fine with the force to check everything again and again against null.. better just an empty Container than a red Exception

[adelaskri]

Amazing, i was just looking for a way to initialize the variable as late modifier !

[naimurhasanrwd]

Thanks, you always make good tutorials with best time utilising.

[Sarah-pyqf]

Thank you soooo much!!! Your explanation is exactly what I was looking for. Awesome!!

[SamadKanton]

Great content dude! But wait, is it worth while to develop a web app using flutter dart? Tried it but it seems to be very slow in compiling or running.

[ProfullowDream]

Hello sir... Can you make Firebases tutorial series...I need deep knowledge

[InsanJdev]

That's an awesome one.
Are you done any videos about classes in flutter or will?

[Amine]

I think we can also use toString() method to change a String? to String type

[abderrazakkenniche]

Huge thanks for this tutorial, it is amazing as you are.
I just have a problem and I always look for the solution without a result
When I use SharedPreferences or SQFLite connections, I must use late keyword and assign my variables inside the initState, though because those connections are asynchronous, I always get late initialization error and this crashes my app.
Hope you can help me dude

[khalilaljamal]

You are my hero Milke, can I use your videos to translate to Arabic language

[AsifKhan-ilgm]

Hi, please make video on flutter_bloc

[derschmeidt]

As I understand so far "late" is a promise that it will be initialized. In which case should I use it? Isn't ? always the better option? What happens if the promise "late" is not initialized later? you said it will be crashed the app. But at which time? Maybe it takes a second to get the asynchronous call for a variable from a server or something. When will it crash if the variable is not there?

[mobihen]

Can you please share you theme name? Or recommend a dark theme?

Great as always!!!

[Anythiny]

null safety in nutshell
please help me in understanding complex json i m stuck

[braafaisal]

Exception has occurred.
LateError (LateInitializationError: Field 'timerr' has not been initialized.)