How do I check an array for duplicates?


This question already has an answer here:


Just call uniq on it (which returns a new array without duplicates) and see whether the uniqed array has less elements than the original:

if a.uniq.length == a.length
  puts "a does not contain duplicates"
  puts "a does contain duplicates"

Note that the objects in the array need to respond to hash and eql? in a meaningful for uniq to work properly.

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