Dart Class, Objects, Instance and reference Variable example. Dart Tutorial for Flutter #8.1

[@aviraltara9515]

To the people, who are learning from this tutorial after 5 years , dart has changed its features now it provide null safety that means int and string does not hold null value now , non nullable datatype to make them null by type casting use - int? nullableNumber; String? nullableText; or use late keyword in front of it for example - late int x ;

[@osteen4x]

You are a very good teacher. God bless you. When i become a professional full stack app developer and i start working, i promise to find you

[@smartherd]

Will be pleased to meet u brother

[@Winner4ever]

Best ever,I thought i knew all the basics until I watched this play list.

[@muhammadsaqib1643]

thanks for "Dart Tutorial for Beginners: Basics and Fundamentals" .

[@harit4767]

You have created a much helpful Dart tutorial playlist. Thank you for your efforts.

[@abdulazizdeveloper7915]

I really don't know how to thank you for your great effort , thank you very much 👍🏻

[@MassimoTodaro74]

I am very thankful for this playlist. Thank you

[@karthickrajalearn]

In 8m 07sec Thanks for Mentioning Default Value

[@mrMayhem1337]

Very well done sir. Straight to the point and clear. Thanks!

[@pagal8192]

You are a very good teacher

[@razasheikh4605]

you are my Guru Shiriank Sir :) i've learned a lot from you regarding Android Studio and now i'm learning flutter as well! i really appreciate your work! Respect and your Student from Pakistan!

[@smartherd]

Thank you very much

[@thiruvenkatasamypranesh80]

hey noob

[@kavinthapa9076]

You are such a Amazing tutor Thanks a lot

[@ajaykotiyal427]

Thank you so much for such tutorials.

[@PrimaClicks]

you have an excellent job. appreciate you man. Perfect!

[@kimanijesse]

perfect😂...great tutorials

[@kashyapkarkar6703]

@Smartherd thank you for this amazing course . it cleared out my basics of programming in a really smooth and understandable way.

[@siva7930]

best example brother

[@saisasisai]

Nice 👌 Tutorial series ...!

[@ricardoaraque6515]

Hi, i'd like do an ask: Why we know the values from an instance by the . instead the [], What type of var is a instance of a class?

[@mrpakravian]

Amaizing teaching

[@pythonlui3922]

Thank you

[@jafetl.ch.8961]

thanks for the tutorial

[@smartherd]

U r always welcome

[@SeraphimTech_io]

good job bro thx a lot every time

[@fayezalle43]

Thank you very much.

[@AR-ok2qt]

Hi Sir, How can you say that a variable is assigned with a class name or method name if while instantiating you are skipping the new keyword ?

[@prajwaldsouza211]

The 'new' keyword is optional from Dart 2.0 onwards. He already mentioned it in the video.

[@haribabumanoharan5366]

If you give some exercise at the end of each video it will be more useful Thanks.

[@pranavyogeshbaradkar1567]

sir how can i learn advance dart tutorial. everywhere i am getting basic dart. please help. BTW great tutorial i understood many basic concept.

[@rajkhanna3089]

Hi brother

[@andrewvillegas122]

Thank you so much for this1

[@krishnakumarramachandran5888]

Thank you sir👍

[@smartherd]

Welcome. Thanks for ur comments

[@zakblacki]

"this " usage is still a little confusing

[@SignumCode]

hello sir your tutorial is really helping but why i got error in this code It should throw exception void main() { var s1= Student(); try{ s1.age="20"; }catch(e) { print(e); } print("${s1.name} is ${s1.age} year old"); s1.sleep(); s1.study(); } class Student { String name = "Peter"; int age = 23; void sleep() { print("${this.name} is sleeping."); } void study() { print("${this.name} is studying."); } }

[@zuhaib4030]

your videos do really help i crush my time behind this to gain knoledge instead of wasting behind video games comment checkers subscribe to smartherd

[@kennedykennedy3133]

thank

[@Proviper666]

I wanted to find how to share one variable in all classes :(

[@animeshbanerjee4379]

we can write in that way without using *this keyword=> void main(){ var s1=S(); s1.id=115;s1.name='animesh'; print('${s1.id} and ${s1.name}'); s1.read(); s1.sleep(); } class S{ int id; String name; void read(){ print('$name is reading'); } void sleep(){ print('$id is sleeping'); } } The code is working so why we need *this keyword here . Please help me out ...I stuck here in oop concepts:-/

[@animeshbanerjee4379]

and one more doubt if we can initialize id and name in main function then why should we repeated the same in class ?

[@kirangouds]

Why cant they just use Interface its so simple

[@shivatiwari1127]

👏

[@rajkhanna3089]

What is the use of this plz aek bar smja do hindi mai

[@algeriennesaffaires7017]

why you say perfetc too much?

[@Quvothe]

Updated code after null safety: void main() { var student1 = Student(); // One Object, student1 is the reference variable student1.id = 23; student1.name = "Peter"; print("${student1.id} and ${student1.name}"); student1.study(); student1.sleep(); var student2 = Student(); student2.id = 45; student2.name = "Sam"; print("${student2.id} and ${student2.name}"); student2.study(); student2.sleep(); } class Student{ int? id; String? name; void study(){ print("${this.name} is now studying."); } void sleep(){ print("${this.name} is now sleeping."); } } // After null safety you cannot introduce new variables like "String name;" without immediatly giving a value to it like String name = "Peter"; . To avoid this problem you can give a ? to the variable : String ? name; now dart knows that the value of the name variable CAN infact be null. I hope i could help!

[@thiruvenkatasamypranesh80]

ns