mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? data(
    1. ListDataPickerData<T> value
    )?,
  2. TResult? error(
    1. ListDataPickerError<T> value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

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

Implementation

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( ListDataPickerData<T> value)?  data,TResult? Function( ListDataPickerError<T> value)?  error,}){
final _that = this;
switch (_that) {
case ListDataPickerData() when data != null:
return data(_that);case ListDataPickerError() when error != null:
return error(_that);case _:
  return null;

}
}