functional programming library in dart
Questions tagged [dartz]
41 questions
0
votes
2 answers
type 'String' is not a subtype of type 'Exception' in type cast
I am using dartz package to return different types from a method, but the problem is I can't return an exception. here is the code below:
class CatPhotoApi {
String endpoint = 'api.thecatapi.com';
Future
Hama Sabah
- 342
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- 9
0
votes
2 answers
Why separating emit() to void function made Bloc working?
I had weird problem on which I spend few hours. I have a bloc file in which I'm using dartZ to easier maintain errors. When I was using bloc like this:
NumberTriviaBloc({required this.getConcreteNumberTrivia}) : super(Empty()) {
…
Dawid Twin
- 27
- 7
0
votes
1 answer
How to obtain only the right hand side value from dartz?
How to obtain only the right hand side value from dartz?
the code is
Some(EitherValue)
the output is:
Some(Right("hi"))
How to get the value of hi without "Some(Right" ?
user16906111
0
votes
1 answer
How to "concatenate" Lefts using Dartz
I want to do something similar to a Either.map5 on several Either types.
But, instead of keeping just the first Left in case of my Eithers being Left, I want to keep all the Left Either contents, and put them into a List.
Basically instead of the…
LeYAUable
- 1,613
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0
votes
1 answer
How to use the fold method for a future type?
I have this method as my repository:
Future> userRegister(FormData formData) async {
try {
final response = await _mourdakApi.userRegister(formData);
bool _isSuccesed;
if (response.statusCode == 200)
…
amin jamali
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- 16
0
votes
1 answer
'Null' can't be assigned to the parameter type 'AccountType Function()'
Is possible that some can explain to me what's going on here. I completely new to flutter and dart programming and I have started a video tutorial on youtube which are using DDD architecture, but I guess the tutorial does not use the new version of…
user3693057
0
votes
1 answer
Dartz interface invalid override
I am currently setting up a phone number verification in flutter with the dartz package.
My firebase_auth_facade.dart inherits from my i_auth_facade.dart but when I try to set up the phonenumber verification functions I get the…
Andi
- 25
- 1
- 5
0
votes
2 answers
Compiler Error when using Either from dartz
I am currently experimenting with the flutter framework and dart and stumbled across a seemingly strange behaviour I fail to understand. Even though the context in which the actual problem occurs is way more complicated, I was even able to replicate…
Silverdust
- 1,503
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- 26
0
votes
1 answer
Return an Either object from a different Either in Dartz
I have a function in Dart where I would like to return an Either value to propagate a Failure(left) or an Object(right). These data are dependent on a different Either value in a function likes this in Dart, but currently it is returning null, even…
sempernoob
- 186
- 2
- 8
-1
votes
2 answers
Flutter : isolate the right hand of Future
iam using riverpod with dartz , nad iam facing a problem that when using a future provider with my function i can't get my hand on the either as well , how can i isolate what i want to retrieve from the function with error handling !
my provider…
Fahmi Sawalha
- 682
- 6
- 19
-1
votes
1 answer
Flutter app: Can't return value of type "Either" from method because it has a return type of "Either"
Can't figure this one out - especially as the type-error in VSCode and Android Studio is telling me that the types are identical.
Error:
"A value of type 'Either (where Failure is defined in ...lib\core\error\failures.dart)'…
Peter Thompson
- 31
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