GroupController constructor Null safety

GroupController(
  1. {dynamic initSelectedItem = const [],
  2. bool isMultipleSelection = false}
)

Implementation

GroupController({
  this.initSelectedItem = const [],
  this.isMultipleSelection = false,
}) : assert(!(isMultipleSelection == false && initSelectedItem.length > 1),
          "you cannot select multiple item when multipleSelection is false");