Array Question FlatironSchool-interview-Question

Array Question FlatironSchool-interview-Question

- (void)viewDidLoad {
    [super viewDidLoad];

    NSArray *germanMakes = @[@"A"];
    
    NSArray * fin = [self sortMidtoFront:germanMakes];
    NSLog(@"fin = [%@]",fin);
    
    NSLog(@"testing Number is %lu",(unsigned long)[self checkMidNumber:2]);
    NSLog(@"testing Number is %lu",(unsigned long)[self checkMidNumber:10]);
}

-(void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}


-(NSMutableArray *)sortMidtoFront:(NSArray *)originArray{
    
        if (!originArray.count) {
            return nil;
        }else if (originArray.count == 1){
            return originArray[0];
        }else{
    
    NSMutableArray * originCopy = originArray.mutableCopy;

    NSUInteger midNumber = [self checkMidNumber:originCopy.count];
    id object = originCopy[midNumber];
    [originCopy removeObjectAtIndex:midNumber];
    [originCopy insertObject: object  atIndex:0];
    
    return originCopy;
    
    }
}


-(NSUInteger)checkMidNumber:(NSUInteger)arrayCount {
    
    unsigned long midIndex = arrayCount/2;
    if (! (midIndex == (int)midIndex) ) {
        midIndex = floor(arrayCount - 1)/2;
    } else {
        midIndex = (arrayCount - 1)/2;
    }
    return midIndex;
}