UReasonType class

Overview

This is an union object to improve safety and convenience of objects using Enum.

Enum provides a very powerful type for a specific group of data, but at the same time it means a loss of flexibility: values not defined in Enum are either completely ignored or an exception is thrown if parsing fails. This union object exists to solve that problem.

This union object handles the KnownValue, a known enum value defined in Lexicon, and the UnknownValue, an unknown string value not defined in Lexicon. In other words, it can handle unknown values while enjoying the type safety of Enum.

Usage

// use when syntax.
final value = object.when(
  knownValue: (data) => data, // => KnownReasonType
  unknownValue: (data) => data, // => String
);

// or simpler way.
if (object.isKnownValue) {
  print(object.knownValue); // => KnownReasonType or null
} else if (object.isUnknownValue) {
  print(object.unknownValue); // => String or null
}
Available extensions
Annotations
  • @freezed

Constructors

UReasonType.knownValue({required KnownReasonType data})
const
factory
UReasonType.unknownValue({required String data})
const
factory

Properties

data Object
no setterinherited
hashCode int
The hash code for this object.
no setterinherited
runtimeType Type
A representation of the runtime type of the object.
no setterinherited

Methods

map<TResult extends Object?>({required TResult knownValue(UReasonTypeKnownValue value), required TResult unknownValue(UReasonTypeUnknownValue value)}) → TResult
inherited
mapOrNull<TResult extends Object?>({TResult? knownValue(UReasonTypeKnownValue value)?, TResult? unknownValue(UReasonTypeUnknownValue value)?}) → TResult?
inherited
maybeMap<TResult extends Object?>({TResult knownValue(UReasonTypeKnownValue value)?, TResult unknownValue(UReasonTypeUnknownValue value)?, required TResult orElse()}) → TResult
inherited
maybeWhen<TResult extends Object?>({TResult knownValue(KnownReasonType data)?, TResult unknownValue(String data)?, required TResult orElse()}) → TResult
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() String
A string representation of this object.
inherited
when<TResult extends Object?>({required TResult knownValue(KnownReasonType data), required TResult unknownValue(String data)}) → TResult
inherited
whenOrNull<TResult extends Object?>({TResult? knownValue(KnownReasonType data)?, TResult? unknownValue(String data)?}) → TResult?
inherited

Operators

operator ==(Object other) bool
The equality operator.
inherited