Dart Collections: Arrays or LIST as Fixed-length List. Dart for Flutter #11.1

[@annapurnasid]

Dart List constructor is not supported any more. You can use the following to create a fixed length list now: List numbersList = List.filled(5, null); int? implies the list items can be null. If you want the default value to be 0 and that the list shouldn't have null value, use this instead: List numbersList = List.filled(5, 0);

[@knight5970]

thanks bro you solved my problem, i have been searching for this accurate explanation for 2 days.

[@jamshaidali3193]

OR you can simply initialized List with having some length e.g ( List numberofvalues = [10 ];

[@harshrishiwal6255]

To people facing the same issue : Reason: In modern Dart, when we write List Dart considers this as a List of integers but we know that in Dart, variables without any value are null! so that's where the problem arises List of integers with a null value in it, Solution: Use this instead, i.e. pre-populate the array: - List numberList = List.filled(5, -1); // -1 can be any integer number

[@raptorrogue4227]

Thankyou 🔥

[@userl-mo4sl]

How about strings?

[@Wongmc644]

Great tutorial but this section on fixed length list and the growable list section is deprecated and not applicable anymore? I'm very new to dart so any errors & omission excepted :-). just sharing info...full source codes below:- new fixed length list:- // is to allow null values assignment List numbersList = List.filled(5, 0, growable: false); numbersList[0] = 73; numbersList[1] = 21; numbersList[2] = 64; numbersList[3] = 73; numbersList[4] = 12; numbersList[1] = null; print(numbersList); //console: [73, null, 64, 73, 12] // above list not iterable!! // to iterate then use below:- List numbersList2 = [1, 2, 3, 4, 5]; for (int e in numbersList2) { print(e); } //using forEach numbersList.forEach((element)=> print('forEach : $element')); ======== full source======== void main() { // fixed length //List numbersList = List(5); deprecated, use below for fixed length List numbersList = List.filled(5, 0, growable: false); numbersList[0] = 73; numbersList[1] = 21; numbersList[2] = 64; numbersList[3] = 73; numbersList[4] = 12; numbersList[1] = null; //myList.add('bbb'); can't use add because not growable print(numbersList); for (int i = 0; i < numbersList.length; i++) { print(numbersList[i]); } //for (int element in numbersList) { // print(element); //} List numbersList2 = [1, 2, 3, 4, 5]; //growable for (int e in numbersList2) { print(e); } numbersList.forEach((element)=> print('forEach : $element')); }

[@anshkukreja5823]

Thanks brother 👍

[@reycoseguma2184]

## FIXED LENGTH LIST List numberList = List.filled(3, 0); numberList[0] = 73; numberList[1] = 73; numberList[2] = 73; print(numberList);

[@jnralexander7913]

How about, accepting input from user in a console stage

[@AnilPawar-lp1zd]

Sir please my one error in list The default list constructor is not available When null safety is enabled

[@yohanmallula3132]

Listnumber = List(5); errors plz any one help

[@tirupathitex3422]

Same

[@MuhammadAfzal-kt7zn]

no more support to fixed length list, we can't create fixed length list through this approach

[@Gurpreet-Chandi]

the delete operation is not working as the error shows that can't remove from fixed length

[@amansarma417]

Like any other language how to take input from the user in Dart

[@nikhilchigali]

You gotta import "dart:io" package for that, Then use stdin.readLineSync();

[@jnralexander7913]

@@nikhilchigali I did it but i still get nothin in the output console

[@muhammadyusoffjamaluddin]

The 'For Loop' give errors. cant print out the elements but giving errors. I am using VSCode with 'Runner' as my code runner, and it is giving error. already installed any Dart extensions and Flutter but why?

[@_haptic_shorts]

Check it once on Online Dart compiler.

[@whitehawk4671]

@@_haptic_shorts still facing error , it saying that at line 4 The default 'List' constructor isn't available when null safety is enabled.

[@whitehawk4671]

@Smartheard, sir i am getting error through your code which i copied from github and it is saying that:- The default 'List' constructor isn't available when null safety is enabled. I am using intellij idea, also i copy pasted the same code in dart pad too..... but still facing the same error again and again

[@zeusking4468]

use this var nums = List.filled(5,0);

[@JK92007]

Gr8...Nice...👍👍👍👍😊...Thanks bro.....

[@smartherd]

Thanks

[@MuhammadAfzal-kt7zn]

No more support to the fixed-length list, we can't create fixed-length list like List list = List(5) it's deprecated now

[@shivatiwari1127]

In numberslist(0),1 numberlist 2 is missing

[@nikhilcuiet]

it error in vs code ide

[@krishnakumarramachandran5888]

Super sir👍

[@smartherd]

thanks

[@tech2ka1]

After = list(5); It's showing list keyword with cross

[@anshulsinha4643]

deprecated

[@shamilyazeen4062]

did anyone get an error while declaring fixed list ?

[@AlamKhan-tg4mr]

Due to null safety its deprecated now, new way to define fixed length list var names = List.filled(10,0); // names.length == 10

[@lordeloalvaro]

Bhai, where's your Flutter tutorial ?

[@smartherd]

Go to my channel page. There you will find a Playlist on. Flutter

[@jjss6717]

kzbin.info/aero/PLlxmoA0rQ-Lw6tAs2fGFuXGP13-dWdKsB&si=VR3tZ8IF6pQImDi5

[@muhammadyusoffjamaluddin]

I got all of the print out errors! code error =254? but you get output? how can?

[@_haptic_shorts]

R u using IntelliJ IDEA or online Dev compiler ?? Are you used IntelliJ then reinstall the sdk and chocolate pack . If you are using online dart compiler, Then copy the code from GITHUB, the Check it once ..👏

[@muhammadyusoffjamaluddin]

@@_haptic_shorts I use VSCode with 'Complete Flutter Extension Pack', at that time even using latest Dart packages.

[@_haptic_shorts]

@@muhammadyusoffjamaluddin Bro once use Online Dart pad , Or you can copy and paste the code from Github , Then try it once .. If the error is not fixed, Then try to reinstall.

[@muhammadyusoffjamaluddin]

@@_haptic_shorts okay thank you, maybe I need to make some changes too on my local.

[@_haptic_shorts]

@@muhammadyusoffjamaluddinit's my pleasure .

[@yashbhardwaj6808]

Now this method has been chnaged List myNumberList = List.filled(5, null, growable: false);