when<TResult extends Object?> method

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

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(
          @JsonKey(name: 'rules') List<RouterRule>? ruleList,
          RouterDomainStrategy? domainStrategy,
          List<BalancingRule>? balancers)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _RouterConfig():
      return $default(_that.ruleList, _that.domainStrategy, _that.balancers);
    case _:
      throw StateError('Unexpected subclass');
  }
}