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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How to Find All Duplicates in an Array in Ruby
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