whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. DNSOutboundRuleAction action,
    2. XrayPortList? qtype,
    3. XrayStringList? domain
    )?
)

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( DNSOutboundRuleAction action,  XrayPortList? qtype,  XrayStringList? domain)?  $default,) {final _that = this;
switch (_that) {
case _DNSOutboundRuleConfig() when $default != null:
return $default(_that.action,_that.qtype,_that.domain);case _:
  return null;

}
}