Nothing can be perfect, and coding is not an exception to it. Despite the best coding and technical fulfilment, errors may creep into the best codes. The ultimate solution to this is debugging and resolving the errors which running the program repeatedly follows.
Flutter, custom web application development service provider, is one of the most trending platforms. Organisations hire Flutter developers to take their significant advantage. However, handling errors in coding on Flutter is extremely important. In this blog, we shall discuss the Error handling part with Either and fpdart while working with Flutter.
Options such as try, throw, and catch are available in the dart language to handle the errors and exceptions. By utilizing a pre-existing exception system, writing codes that may become hazardous in the future becomes a simplified task. Nevertheless, bear in mind the following essential considerations when engaging in this task:
These are the key points to understand the whole journey of error handling. This calls for a different remedy which we shall discuss in the next section. Organizations should hire Flutter developers to learn and understand more about it.
It is possible to manage and handle the issues mentioned in the above section using Functional Programming Language (FLP). Functional Programming Language is a set of codes that helps avoid errors by writing clean codes in a declarative programming style.
It is opposite to that of the object-oriented programming style. Many modern languages provide support to object-oriented and functional paradigms. However, FLP finds wide usage in Dart and Flutter:
These are the reasons you may need to hire Flutter developers to learn about the FLP and its functions for your codes.
The Either type lets one specify the failure and success of the signature function. Here is an example of coding in Either type with fdpart:
import 'package:fpdart/fpdart.dart';
Either parseNumber(String value) {
try {
return Either.right(double.parse(value));
} on FormatException catch (e) {
return Either.left(e);
}
}
The code mentioned above may require more work to produce an output. Here is a solution to it, using the try-catch instructor of functional programming language:
Either parseNumber(String value) {
return Either.tryCatch(
() => double.parse(value),
(e, _) => e as FormatException,
);
}
The output that comes out is this:
/// Try to execute `run`. No error, then return [Right].
/// Otherwise, return [Left] with the result of `onError`.
factory Either.tryCatch(
R Function() run,
L Function(Object ob, StackTrace st) onError) {
try {
return Either.of(run());
} catch (e, s) {
return Either.left(onError(e, s));
}
}
The functional style of this program is below. It is a code that describes this code in a fully functioning style:
Iterable>
parseFizzBuzz(List strings) => strings.map(
(string) => parseNumber(string).map(
(value) => fizzBuzz(value) // no tear-off
)
);
Using tear-off, there are chances for more simplicity and ease in this piece of coding:
Iterable>
parseFizzBuzz(List strings) => strings.map(
(string) => parseNumber(string).map(
fizzBuzz // with tear-off
)
);
If it’s possible to do this by oneself, one should hire Flutter developers to achieve the maximum benefit.
Here are some more functions of Either that can help manage and handle the Error in programs. The first code is for deciding the left and right direction of values:
/// Create an instance of [Right]
final right = Either.of(10);
/// Create an instance of [Left]
final left = Either.left('none');
This is how Either can help in mapping values:
/// Mapping the right value to [String]
final mapRight = right.map((a) => '$a');
/// Mapping the left value to an [int]
final mapLeft = right.mapLeft((a) => a.length);
Pattern matching programming with the help of Either:
/// Pattern matching
final number = parseNumber('invalid');
/// Unwrap error/success with the fold method
number.fold( // same as number.match()
(exception) => print(exception),
(value) => print(value),
);
This coding is very versatile and works anywhere. You can try researching it, or the best way is to hire Flutter developers. However, here are some key points that one should remember about programming:
It is easy to use this language package by knowing more about it. You can also check here how to handle error with Bloc pattern in Flutter?
The error handling stage is an integral part of the development cycle. It is essential to get a system that runs without any issues. It is possible only if one knows the art of scanning the errors and their resolutions. This factor would reduce errors at almost every stage.
Therefore, this blog has taken us on the journey of handling various fictional errors. It is necessary to save time, and resources and get the codes to run effectively.