Get duplicates in NSArray

Question

I have an NSArray which contains a few duplicate objects. I want to print which objects are getting duplicated, for example:

NSArray * array = [NSArray arrayWithObjects: A, B, C, A, B];

Now I want to print in my console A & B as these are duplicated.

How do I do this?

Answer 1

You can use NSCountedSet for this. you can add all the objects in a counted set, then use the countForObject: method to find out how often each object appears. read about NSCountedSet for further reference

Answer 2

Use an NSCountedSet and only print the elements that returns a number>1 for countForObject: method