when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String packageName,
    2. String? packageVersion
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(String packageName, String? packageVersion) $default,
) {
  final _that = this;
  switch (_that) {
    case _PackageDependency():
      return $default(_that.packageName, _that.packageVersion);
  }
}