Thirteen Consecutive

number = "73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450"

class LargestConsecutive

  def initialize(big_string_number)
    @big_string_number = big_string_number.gsub!("\n",'')
  end

  # alternatively use each_cons
  def chop(string, length)
    array = []
    string.split("").each_cons(length) { |a| array.push(a.join("")) }
=begin
    array = []
    string_arr = string.split("")
    string_arr.each_with_index do |char, i|
      num = string_arr[i..(i + length - 1)].join("")
      array << num 
    end
=end
    array
  end

  # returns a Fixnum product for a given string number
  def product(string)
    product = string.split("").each.map { |string_number| string_number.to_i }.inject(:*)
  end

  # returns a new array of products given an array of string numbers
  def product_each(array)
    array.each.map { |string_number| product(string_number) }
  end

  def largest_consecutive(length)
    product_each( chop(@big_string_number, length) ).max
  end

end

print LargestConsecutive.new(number).largest_consecutive(13) # => 23514624000