fold<R> method

R fold<R>(R onSuccess(T value), R onFailure(String error))

Transforms the result based on its state using pattern matching.

• onSuccess: Function to call with the value if this is a success
• onFailure: Function to call with the error message if this is a failure
• Returns: The result of whichever function was called

Implementation

R fold<R>(R Function(T value) onSuccess, R Function(String error) onFailure) {
  if (isSuccess) {
    return onSuccess(_value as T);
  } else {
    return onFailure(_error!);
  }
}