# This way uses .sort and will return the 3rd greatest number in an array

def thirdgreatest(nums)
  i = 0
  nums.sort
  nums[2]
end
p thirdgreatest([4,5,6,7])

# This way just uses while/if etc...

def third_greatest(nums)
  first = nil
  second = nil
  third = nil
  idx = 0
  while idx < nums.length
    value = nums[idx]
    if first == nil || value > first
      third = second
      second = first
      first = value
    elsif second == nil || value > second
      third = second
      second = value
    elsif third == nil || value > third
      third = value
    end
    idx += 1
  end
  return third
end