How to Find All Duplicates in an Array in Ruby

When it comes to Ruby programming, Ruby has a helpful method for removing duplicates from an array, the uniq method. However, there are times when you simply want to know which elements in Ruby arrays are duplicates. In this guide we'll add a method to the Array class that returns all duplicates.

This Ruby tutorial will help you answer the technical interview question: "Build a method that returns all of the duplicates from an array in ruby."

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[ripperx]

To find dups in an array is take a set and
[item for item in originalArray if item not in SetArray] via list comprehension to get the dup values. Your tutorials are good

[kathircool]

How to create 1000 employee record in my table using rails console??

[alecamico]

Is there a way I can read a file and have it print out how many lines are in the text file and then determine how many time a word shows up in each line? Any helped would be greatly appreciated