fold<T> method

T fold<T>({ required T onSuccess(KAuthUser user), required T onFailure(String? errorMessage), })

성공/실패에 따라 다른 값 반환

final message = result.fold(
  onSuccess: (user) => '환영합니다, ${user.displayName}님!',
  onFailure: (error) => '로그인 실패: $error',
);

Implementation

T fold<T>({
  required T Function(KAuthUser user) onSuccess,
  required T Function(String? errorMessage) onFailure,
}) {
  if (success && user != null) {
    return onSuccess(user!);
  }
  return onFailure(errorMessage);
}