whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. DpkMode mode,
    2. Catalog? catalog,
    3. List<String>? workspace,
    4. bool sortPubspec,
    5. VersionConstraint version,
    )?
)

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( DpkMode mode,  Catalog? catalog,  List<String>? workspace,  bool sortPubspec,  VersionConstraint version)?  $default,) {final _that = this;
switch (_that) {
case _DpkConfig() when $default != null:
return $default(_that.mode,_that.catalog,_that.workspace,_that.sortPubspec,_that.version);case _:
  return null;

}
}