Objective C - Manual Array FIFO Queue

Question

Just wondering the best way to create a manual array, without using NSMutalbleArray, I have being researching best possible solutions but without an elegant answer, what do you

Answer 1

Array with FIFO manner:

if (mutArr.count == 5) {
        for (int j = 0; j < 4; j++) {
            [mutArr exchangeObjectAtIndex:j withObjectAtIndex:j+1];
        }
        [mutArr removeObjectAtIndex:4];
        [mutArr addObject:mutDict];
    }else{
        [mutArr addObject:mutDict];
    }