Err<T> class final

Failed outcome carrying failure.

Inheritance

Constructors

Err(Failure failure)
const

Properties

failure → Failure
final
failureOrNull → Failure?
The failure, or null for Ok.
no setterinherited
hashCode → int
The hash code for this object.
no setteroverride
isErr → bool
Whether this is an Err.
no setterinherited
isOk → bool
Whether this is an Ok.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
valueOrNull → T?
The success value, or null for Err.
no setterinherited

Methods

flatMap<R>(Result<R> transform(T value)) → Result<R>
Transforms the success value into a new Result (flatMap), keeping a failure untouched.
inherited
flatMapAsync<R>(Future<Result<R>> transform(T value)) → Future<Result<R>>
Like flatMap, for an asynchronous transform.
inherited
fold<R>(R onFailure(Failure failure), R onSuccess(T value)) → R
Runs onFailure for Err or onSuccess for Ok and returns the outcome. Argument order matches dartz's Either.fold (failure first).
override
getOrDefault(T fallback) → T
The success value, or fallback for Err.
inherited
getOrElse(T onFailure(Failure failure)) → T
The success value, or the result of onFailure for Err.
inherited
map<R>(R transform(T value)) → Result<R>
Transforms the success value, keeping a failure untouched.
inherited
mapAsync<R>(Future<R> transform(T value)) → Future<Result<R>>
Like map, for an asynchronous transform.
inherited
mapBusiness<R>(Failure ifBusinessError, Result<R> onData(T data)) → Result<R>
Transport-aware mapping: maps the success value while letting TransportFailures and CancelledFailures pass through UNCHANGED; substitutes ifBusinessError for any other failure so feature-specific copy is preserved for real server errors. (An offline or cancelled request is not a business error and must not be relabelled as one.)
inherited
mapErr(Failure transform(Failure failure)) → Result<T>
Transforms the failure, keeping a success untouched.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
onErr(void action(Failure failure)) → Result<T>
Runs action for a failure and returns this result unchanged.
inherited
onOk(void action(T value)) → Result<T>
Runs action for a success and returns this result unchanged — for side effects in a chain (.onOk(emit).onErr(log)).
inherited
toString() → String
A string representation of this object.
override

Operators

operator ==(Object other) → bool
The equality operator.
override