whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. Relay relay,
    2. Map<String, Namespace> namespaces,
    3. int expiry,
    4. ConnectionMetadata controller,
    5. Map<String, RequiredNamespace>? requiredNamespaces,
    6. Map<String, RequiredNamespace>? optionalNamespaces,
    7. Map<String, String>? sessionProperties,
    8. ProposalRequestsResponses? proposalRequestsResponses,
    )?
)

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( Relay relay,  Map<String, Namespace> namespaces,  int expiry,  ConnectionMetadata controller,  Map<String, RequiredNamespace>? requiredNamespaces,  Map<String, RequiredNamespace>? optionalNamespaces,  Map<String, String>? sessionProperties,  ProposalRequestsResponses? proposalRequestsResponses)?  $default,) {final _that = this;
switch (_that) {
case _WcSessionSettleRequest() when $default != null:
return $default(_that.relay,_that.namespaces,_that.expiry,_that.controller,_that.requiredNamespaces,_that.optionalNamespaces,_that.sessionProperties,_that.proposalRequestsResponses);case _:
  return null;

}
}