Deep Dive into Flutter’s Try and Catch Block!

Make a separate dart file with name as error_controller and then write the below code.

import 'package:employee_bloc/models/employee.dart';
import 'package:fpdart/fpdart.dart';

typedef EitherType<T> = Either<String, T>;

typedef FutureEither<T> = Future<EitherType<T>>;

class ErrorController{
  FutureEither<Employee> getRequest() async{
    try{
      return right(
              Employee(
                employeeId: '123',
                employeeName: 'anuj',
                employeeDesignation: 'flutter dev',
                employeeJoiningDate: DateTime.now(),
                employeeLeavingDate: DateTime.utc(2050),
              ),
            );
    }catch(e){
      return left(e.toString());
    }
  }
}

After that, you can use the above as,

void getData(){
  ErrorController errorController;
  final result = await errorController.getRequest();
  setState((){
    result.fold((l)=> textToShow = l, (r)=> textToShow=r.employeeName);
  })
}