whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. Market market,
    2. List<Language> availableLanguages,
    3. Currency currency,
    4. String isoCode,
    5. String name,
    6. String unitSystem,
    )?
)

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( Market market,  List<Language> availableLanguages,  Currency currency,  String isoCode,  String name,  String unitSystem)?  $default,) {final _that = this;
switch (_that) {
case _Country() when $default != null:
return $default(_that.market,_that.availableLanguages,_that.currency,_that.isoCode,_that.name,_that.unitSystem);case _:
  return null;

}
}