whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? knownValue(
    1. KnownHostStatus data
    )?,
  2. TResult? unknown(
    1. String data
    )?,
})

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( KnownHostStatus data)?  knownValue,TResult? Function( String data)?  unknown,}) {final _that = this;
switch (_that) {
case HostStatusKnownValue() when knownValue != null:
return knownValue(_that.data);case HostStatusUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}