whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String exchangeId, ExchangeAsset asset, String amount, String recipient,)?)

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( String exchangeId,  ExchangeAsset asset,  String amount,  String recipient)?  $default,) {final _that = this;
switch (_that) {
case _GetExchangeUrlParams() when $default != null:
return $default(_that.exchangeId,_that.asset,_that.amount,_that.recipient);case _:
  return null;

}
}