fold<T> abstract method

T fold<T>({ required SyncSuccessCallback<S, T> onSuccess, required SyncFailureCallback<E, T> onFailure, })

Transforms this result into a value of type T by applying the appropriate callback based on whether this is a success or failure.

This method only accepts synchronous callbacks. For async operations, use asyncFold.

Example:

final result = Success(42);
final string = result.fold(
  onSuccess: (value) => 'Success: $value',
  onFailure: (error) => 'Error: ${error.message}',
);

Implementation

T fold<T>({
  required SyncSuccessCallback<S, T> onSuccess,
  required SyncFailureCallback<E, T> onFailure,
});