Method: Array#first_duplicate

Defined in:
lib/ditz/util.rb

#first_duplicate ⇒ Object 



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# File 'lib/ditz/util.rb', line 41

def first_duplicate
  sa = sort
  (1 .. sa.length).argfind { |i| (sa[i] == sa[i - 1]) && sa[i] }
end