Hello

I am trying to output the duplicate elements in an array. I looked into
the api of ruby I found uniq method which outputs the array with no
duplication. What i want is to know which elements is duplicated.
For example

array = ["apple", "banana", "apple", "orange"]
=> ["apple", "banana", "apple", "orange"]
array.uniq
=> ["apple", "banana", "orange"]

I want the method to tell me that apple is the duplicated element

I tried this but it does not work

array - array.uniq

any idea

Regards
Shuaib
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