Sort NSMutableArray with strings that contain numbers?

Question

I have a NSMutableArray and it has the users high scores saved into it. I want to arrange the items numerically (the numbers are stored in NSStrings.)
Example:
4,2,7,8

Answer 1

This code works. I tried it:

NSMutableArray *unsortedHighScores = [[NSMutableArray alloc] initWithObjects:@"4", @"2", @"7", @"8", nil];

NSMutableArray *intermediaryArray = [[NSMutableArray alloc] init];

for(NSString *score in unsortedHighScores){
    
    NSNumber *scoreInt = [NSNumber numberWithInteger:[score integerValue]];
    [intermediaryArray addObject:scoreInt];
}

NSArray *sortedHighScores = [intermediaryArray sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"%@", sortedHighScores);

The output is this:

2

4

7

8

If you have any questions about the code, just ask in the comments. Hope this helps!