Question

I have this NSArray:

NSArray* temp=[[NSArray alloc]
initWithObjects:@"one",@"five",@"two",nil];

for(NSString* obj in temp){ 
    NSLog(@"current item:%@ Next item is:%@",obj, ***blank***);
}

What needs to replace blank? Do I need to know the upcoming object?

Answer 1

This only works if your objects are unique (i. e. there are no identical objects in the array):

id nxt = nil;
int nxtIdx = [temp indexOfObject:idx] + 1;
if (nxtIdx < temp.count) {
    nxt = [temp objectAtIndex:nxtIdx];
}
NSLog(@"current item:%@ Next item is:%@", obj, nxt);

But in my opinion, this is a hack. Why not use a normal for loop with the index of the object:

for (int i = 0; i < temp.count; i++) {
    id obj = [temp objectAtIndex:i];
    id next = (i + 1 < temp.count) ? [temp objectAtIndex:i + 1] : nil;
}

Or (recommended) enumerate it using a block

[temp enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    id next = nil;
    if (idx + 1 < temp.count) {
        next = [temp objectAtIndex:idx + 1];
    }
}];

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