private void RemoveAction(RemoveTodoAction action)
{
_todoCollection.Delete(action.Id);
}
private static ImmutableArray <TodoItem> RemoveTodoReducer(ImmutableArray <TodoItem> previousState, RemoveTodoAction action)
{
var todoToDelete = previousState.First(todo => todo.Id == action.Id);
return(previousState.Remove(todoToDelete));
}