gistfile1.rb

# Given an array_of_ints, find the highest_product you can get from three of the integers.
# The input array_of_ints will always have at least three integers.

def highest_product(arr)
  highest = arr[0]
  lowest = arr[0]

  highest_of_two = arr[0] * arr[1]
  highest_of_three = arr[0] * arr[1] * arr[2]

  arr.each_with_index do |current, index|
    highest_of_three = [highest_of_three, (highest_of_two * current)].max
    highest_of_two = [highest_of_two, (current * highest)].max
    highest = [highest, current].max
    puts "current = #{current} & highest = #{highest} & highest_of_two = #{highest_of_two} & highest_of_three = #{highest_of_three}"
  end
  highest_of_three
end

def assert_equal(actual, expected)
  puts "Expected: #{expected} and got #{actual}" unless actual == expected
end

assert_equal(highest_product([1,4,5,3,6]), 120)
assert_equal(highest_product([1,10,1,-5,1,-100]), 10)