maybeMap<TResult extends Object?> method

  1. @optionalTypeArgs
TResult maybeMap<TResult extends Object?>({
  1. TResult idle(
    1. DataStateIdle<T> value
    )?,
  2. TResult loading(
    1. DataStateLoading<T> value
    )?,
  3. TResult error(
    1. DataStateError<T> value
    )?,
  4. TResult success(
    1. DataStateSuccess<T> value
    )?,
  5. required TResult orElse(),
})

A variant of map that fallback to returning orElse.

It is equivalent to doing:

switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return orElse();
}

Implementation

@optionalTypeArgs TResult maybeMap<TResult extends Object?>({TResult Function( DataStateIdle<T> value)?  idle,TResult Function( DataStateLoading<T> value)?  loading,TResult Function( DataStateError<T> value)?  error,TResult Function( DataStateSuccess<T> value)?  success,required TResult orElse(),}){
final _that = this;
switch (_that) {
case DataStateIdle() when idle != null:
return idle(_that);case DataStateLoading() when loading != null:
return loading(_that);case DataStateError() when error != null:
return error(_that);case DataStateSuccess() when success != null:
return success(_that);case _:
  return orElse();

}
}