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

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Dart beginners guide. Explore Arrays or Fixed length List in Ordered Dart Collections. Dart supports various Collection types such as Set, Map, HashSet, HashMap, Queue, LinkedList. Let us explore each one of them in this section.
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[@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?

[@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 ];

[@AnilPawar-lp1zd]

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

[@JK92007]

Gr8...Nice...👍👍👍👍😊...Thanks bro.....

[@smartherd]

Thanks

[@Gurpreet-Chandi]

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

[@shivatiwari1127]

In numberslist(0),1 numberlist 2 is missing

[@krishnakumarramachandran5888]

Super sir👍

[@smartherd]

thanks

[@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 👍

[@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);

[@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.

[@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]

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 .

[@nikhilcuiet]

it error in vs code ide

[@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

[@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

[@tech2ka1]

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

[@anshulsinha4643]

deprecated

[@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

[@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]

th-cam.com/play/PLlxmoA0rQ-Lw6tAs2fGFuXGP13-dWdKsB.html&si=VR3tZ8IF6pQImDi5