Result<S, E extends AppException> class sealed

A type that represents either a success value of type S or a failure value of type E.

This implementation is based on the Either monad pattern, commonly used for error handling in functional programming. It forces explicit handling of both success and failure cases, making error handling more predictable and type-safe.

Type parameters:

  • S: The type of the success value
  • E: The type of the error value, must extend AppException
Implementers
Annotations
  • @immutable

Properties

hashCode → int
The hash code for this object.
no setterinherited
isFailure → bool
Whether this instance represents a failed result
no setter
isSuccess → bool
Whether this instance represents a successful result
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
valueOrNull → S?
Returns the success value if present, null otherwise
no setter

Methods

asyncFold<T>({required AsyncSuccessCallback<S, T> onSuccess, required AsyncFailureCallback<E, T> onFailure}) → Future<T>
Asynchronous version of fold that handles Future operations in the success case.
fold<T>({required SyncSuccessCallback<S, T> onSuccess, required SyncFailureCallback<E, T> onFailure}) → T
Transforms this result into a value of type T by applying the appropriate callback based on whether this is a success or failure.
map<T>(T transform(S value)) → Result<T, E>
Transforms the success value of this result while preserving the Result wrapper.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

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