whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? resultAvailable(
    1. ResultAvailable data
    )?,
  2. TResult? resultUnavailable(
    1. ResultUnavailable data
    )?,
  3. TResult? unknown(
    1. Map<String, dynamic> 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( ResultAvailable data)?  resultAvailable,TResult? Function( ResultUnavailable data)?  resultUnavailable,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UTempCheckHandleAvailabilityResultResultAvailable() when resultAvailable != null:
return resultAvailable(_that.data);case UTempCheckHandleAvailabilityResultResultUnavailable() when resultUnavailable != null:
return resultUnavailable(_that.data);case UTempCheckHandleAvailabilityResultUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}