whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. ExchangeAsset sourceToken,
    2. ExchangeAsset toToken,
    3. String recipient,
    4. String amount,
    5. String? address,
    )?
)

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( ExchangeAsset sourceToken,  ExchangeAsset toToken,  String recipient,  String amount,  String? address)?  $default,) {final _that = this;
switch (_that) {
case _GetQuoteParams() when $default != null:
return $default(_that.sourceToken,_that.toToken,_that.recipient,_that.amount,_that.address);case _:
  return null;

}
}