public static TodoState AddTodoAction(TodoState state, AddTodoAction action)
{
int index = state.Todos.Count;
state.Todos.Add(new Model.Todo {
Description = action.Description, Index = index
});
return(new TodoState(state.Todos));
}
public static TodoState MarkAsDone(TodoState state, MarkAsDoneAction action)
{
state.Todos.Single(c => c.Index == action.Index).Done = true;
return(new TodoState(state.Todos));
}