gistfile1.rb

class LuckyArray < Array
  def self.from_string(str)
    new str.split('').map(&:to_i)
  end

  def front_half
    slice 0, length/2
  end
  
  def back_half
    idx = length - length/2 
    slice idx, length/2 
  end
  
  def sum
    inject :+
  end
  
  def lucky?
    front_half.sum == back_half.sum
  end
end

def luck_check(str)
  LuckyArray.from_string(str).lucky?
end