Array into ranges of consecutive numbers
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ar = [1, 2, 3, 5, 6, 8, 9]prev = ar[0]p ar.slice_before { |e| prev, prev2 = e, prev prev2 + 1 != e}.map{|a| a[0]..a[-1]} # >> [1..3, 5..6, 8..9]ar = [1, 2, 3, 5, 6,7, 8, 9,11]prev = ar[0]p ar.slice_before { |e| prev, prev2 = e, prev prev2 + 1 != e}.map{|a| a[0]..a[-1]} # >> [1..3, 5..9, 11..11]
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