whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String symbol,
    2. String amount,
    3. int unit,
    4. String formatted,
    5. String formattedAlt,
    )?
)

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 symbol,  String amount,  int unit,  String formatted,  String formattedAlt)?  $default,) {final _that = this;
switch (_that) {
case _AmountCompat() when $default != null:
return $default(_that.symbol,_that.amount,_that.unit,_that.formatted,_that.formattedAlt);case _:
  return null;

}
}