How to remove duplicate pair values from given array in Ruby?

Question

I want to remove a pair of 'duplicates' from an array of strings, where each element has the form R1,R2, with varying numbers. In my case, a duplicate would be R2,R1 because it has the same elements of R1,R2 but inverted.

Given:

a = ['R1,R2', 'R3,R4', 'R2,R1', 'R5,R6']

The resulting array should be like so:

a = ['R1,R2', 'R3,R4', 'R5,R6']

How could I remove the duplicates so I would have the following?

Answer 1

A solution with Set

require 'set' 

a.uniq { |item| Set.new(item.split(",")) }  # => ["R1,R2", "R3,R4", "R5,R6"]

Answer 2

Here is a working example :

array = ['R1,R2', 'R3,R4', 'R2,R1', 'R5,R6']

array.uniq { |a| a.split(',').sort }