getting NSArray objects using index numbers

Question

I have a array with 8 objects now and i have another array with 4 index's .I want to get objects from the first array using index values present in the second array.(objective c)

NSArray *arr = @[@"ECE",@"CSE",@"MECH",@"CIVIL",@"AERO",@"IT",@"EEE",@"EM"];

NSArray *indexNumberArray = @[0,2,5,7];

Answer 1

Try this :

NSArray *arr = @[@"ECE",@"CSE",@"MECH",@"CIVIL",@"AERO",@"IT",@"EEE",@"EM"];

    NSArray *indexNumberArray = @[@0,@2,@5,@7];
    NSMutableArray *arrNew = [NSMutableArray new];
    for (NSNumber *index in indexNumberArray) {
       [arrNew addObject:[arr objectAtIndex:[index integerValue]]];
    }

Output