whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(@JsonKey.new(name: 'payer_name') String? payerName, @JsonKey.new(name: 'payer_slade_code') int? payerSladeCode, @JsonKey.new(name: 'member_number') String? memberNumber, @JsonKey.new(name: 'member_name') String? memberName, @JsonKey.new(name: 'valid_to') String? validTo, @JsonKey.new(name: 'valid_from') String? validFrom,)?)

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(@JsonKey(name: 'payer_name')  String? payerName, @JsonKey(name: 'payer_slade_code')  int? payerSladeCode, @JsonKey(name: 'member_number')  String? memberNumber, @JsonKey(name: 'member_name')  String? memberName, @JsonKey(name: 'valid_to')  String? validTo, @JsonKey(name: 'valid_from')  String? validFrom)?  $default,) {final _that = this;
switch (_that) {
case _Cover() when $default != null:
return $default(_that.payerName,_that.payerSladeCode,_that.memberNumber,_that.memberName,_that.validTo,_that.validFrom);case _:
  return null;

}
}