whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String? type,
    2. String? code,
    3. String? decline_code,
    4. String? message,
    5. String? param,
    )?
)

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? type,  String? code,  String? decline_code,  String? message,  String? param)?  $default,) {final _that = this;
switch (_that) {
case _PaymentElementChangeEvent() when $default != null:
return $default(_that.type,_that.code,_that.decline_code,_that.message,_that.param);case _:
  return null;

}
}