Question

I have an NSMutableArray filled with Task objects. I want to be able to delete those whose completed property are set to YES

    NSMutableArray *allTasks = (NSMutableArray *)[[TaskStore defaultStore] allTasks];

    NSMutableArray *completedTasks;

    for (Task *task in allTasks) {
        if ([task completed]) {
            [completedTasks addObject:task];
        }
    }

    [allTasks removeObjectsInArray:completedTasks];

While debugging I noticed that the completedTasks array is always empty. Why is this?

Answer 1

You forgot to initialize the completedTasks :

NSMutableArray *completedTasks = [NSMutableArray array];