third_greatest_alt created by barbchoy - https://repl.it/Br7X/2749

third_greatest_alt.rb

# Write a method that takes an array of numbers in. Your method should
# return the third greatest number in the array. You may assume that
# the array has at least three numbers in it.
#
# Difficulty: medium.

def third_greatest(nums)
  sorted_nums=[]
  new_nums=[]
  i=0
  j=0
  biggest_i=0
  biggest_num=0

  while j< nums.length
    while i<nums.length
      if nums[i]>=biggest_num
        biggest_i=i
        biggest_num=nums[biggest_i]
      end
    i+=1
    end
  
  j+=1
  if j==nums.length
    sorted_nums.push(nums[biggest_i])
    nums.delete(biggest_num)
    biggest_num=0
    j=0
    i=0
  end
  
end

  return sorted_nums[2]
end

# These are tests to check that your code is working. After writing
# your solution, they should all print true.

puts("\nTests for #third_greatest")
puts("===============================================")
    puts(
      'third_greatest([5, 3, 7]) == 3: ' +
      (third_greatest([5, 3, 7]) == 3).to_s
    )
    puts(
      'third_greatest([5, 3, 7, 4]) == 4: ' +
      (third_greatest([5, 3, 7, 4]) == 4).to_s
    )
    puts(
      'third_greatest([2, 3, 7, 4]) == 3: ' +
      (third_greatest([2, 3, 7, 4]) == 3).to_s
    )
puts("===============================================")