Reading Chapter 7 - KVC/KVO of Cocoa Programming
https://www.bignerdranch.com/we-write/cocoa-programming/
And learning about Array Operators like
- avg
- count
- max
- min
- sum
These could come in handy.
NSNumber *theAverages
theAverage = [employees valueForKey:@"avg.expectedRaise"];
They also have a forum (http://forums.bignerdranch.com)
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