whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. @JsonKey.new(name: 'rules') List<RouterRule>? ruleList,
    2. RouterDomainStrategy? domainStrategy,
    3. List<BalancingRule>? balancers
    )?
)

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: 'rules') List<RouterRule>? ruleList,
          RouterDomainStrategy? domainStrategy,
          List<BalancingRule>? balancers)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _RouterConfig() when $default != null:
      return $default(_that.ruleList, _that.domainStrategy, _that.balancers);
    case _:
      return null;
  }
}