whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. List<Language> availableLanguages,
    2. List<Country> availableCountries,
    3. Language language,
    4. Country country,
    5. Market market,
    )?
)

A variant of when that fallback to returning null

It is equivalent to doing:

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

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( List<Language> availableLanguages,  List<Country> availableCountries,  Language language,  Country country,  Market market)?  $default,) {final _that = this;
switch (_that) {
case _Localization() when $default != null:
return $default(_that.availableLanguages,_that.availableCountries,_that.language,_that.country,_that.market);case _:
  return null;

}
}