functional programming library in dart
Questions tagged [dartz]
41 questions
1
vote
1 answer
json_serializable flutter parse and map with key connect with modal and mapper
Thais is my json format
"recommended": {
"section_title": "Recommended",
"section_sub_title": "Recommended",
"data": {
"Allahabad": [
{
"gym_id": "9",
…
Arun99178
- 11
- 2
1
vote
1 answer
Flutter bloc 8 some error in Either / fold return with async
I am migrating my project to the new version of Flutter and I use the BloC package. As you know Bloc has been updated and it has changed most of its code, so now I am adapting mine, but I have some bugs.
The argument type 'Future Function(bool)'…
Daniel Roldán
- 1,328
- 3
- 20
1
vote
0 answers
when should i let the application crash?
i have two questions:
Firstly
when should i let the application crash?
Secondly:
this code from resoCoder. i do NOT understand it!!!!!!!!!!!!
how could he crash the app if the todos is not right?!
T getOrCrash() {
// id = identity - same as…
Mariam Albarghouti
- 409
- 5
- 22
1
vote
0 answers
How to cast Right side of Either to generic type in flutter
I have an extension to Task (from the dartz package) which looks like this
extension TaskX, U> on Task {
Task> mapLeftToFailure() {
return this.map(
// Errors are returned as objects
…
Manu
- 372
- 2
- 12
1
vote
1 answer
How can I define a return type of a lambda function in Dart?
I try to create a repository with type safe parameters. For this, I created the function parameter as a typedef and use the Dartz package, to be able to return either a failure or the desired result.
The issue is, that I have to create a specific…
Tyx
- 33
- 4
1
vote
1 answer
How To Access The Failed Value From Either?
In the example below, we have:
Type: Either, int>
If No Error: right(number)
If Error: left(RangedNumberValueFailuresAbstract.invalidNumber(failedNumberValue: number))
If we need to access the…
Erezahr
- 21
- 4
1
vote
0 answers
dartz: exception in function is not caught in attempt
I am using dartz with flutter. I want to use Either type with all API calls as suggested in this article
Below is the way I have wrapped API to Task
Future> receiveOtp(
String phoneNumber) async {
return…
harishr
- 17,807
- 9
- 78
- 125
0
votes
1 answer
is dartz Either Nesisty or just matter of taste?
So before I start I,m a beginner in Flutter and in programming all together.
I used to just follow video tutorials and consider their best practices, one of my earliest tutorials introduced me to the Dartz library and it was used when getting data…
Magdy Samy
- 3
- 5
0
votes
1 answer
With the dartz Dart lib, how can you construct an IMap from key-value pairs?
I see the factory constructor factory IMap.fromPairs(FoldableOps> foldableOps, Order kOrder), but how do you use FoldableOps to be able to pass an Iterable> into it?
voxoid
- 1,164
- 1
- 14
- 31
0
votes
1 answer
With dartz is it possible to pass a failure on to the function that is folding my either
I have the following code
class GetAuthUserUseCase {
final AuthRepository _authRepository;
GetAuthUserUseCase({
required AuthRepository authRepository,
}) : _authRepository = authRepository;
Future> call()…
anonymous-dev
- 2,897
- 9
- 48
- 112
0
votes
0 answers
How to use Either/DartZ with null Safety flutter
I'm trying to do some tests on my project in clean architecture using Dartz:
My entity class:
// ignore_for_file: public_member_api_docs, sort_constructors_first
class User {
final String fullname;
final String email;
final String password;
…
0
votes
0 answers
0
votes
1 answer
Receiving from a .fold "emit was called after an event handler completed normally."
Since I found the solution hidden of my problem in the comments, I am putting it here in a more prominent place:
Problem: I received the above error after awaiting some function within a Dart .fold method.
_failureOrProperty.fold(
…
w461
- 2,168
- 4
- 14
- 40
0
votes
1 answer
How to initialize Either Right to an empty value in flutter - Reloaded
How do I correctly initialize my Either object in the following code?
class JobListState extends Equatable {
const JobListState({
this.status = JobListStatus.initial,
this.jobListSections = Right([]),
this.filter,
});
final…
w461
- 2,168
- 4
- 14
- 40
0
votes
1 answer
Type 'Right' is not a subtype of type 'String?' in type cast
I'm trying to get the String 'bairro' from this part of code:
var infoCepJSON = await viaCepSearchCep.searchInfoByCep(cep: '$_cep')
But, its return a Type Either. How can I get the string bairro in this case?
If I put: …
