mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? serverError(
    1. _ServerError value
    )?,
  2. TResult? clientError(
    1. _ClientError value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( _ServerError value)?  serverError,TResult? Function( _ClientError value)?  clientError,}){
final _that = this;
switch (_that) {
case _ServerError() when serverError != null:
return serverError(_that);case _ClientError() when clientError != null:
return clientError(_that);case _:
  return null;

}
}