bitwise task pair programming

bitwise.rb

def bitwise(a, b)
  array = []
  array_trunc = []

  for i in a..b do
    array << i.to_s(2)
  end

  array.sort.reverse!
  len = array[0].length

  number = Array.new(len, 1)

  array.each do |num|
    diff = num.length - len
    if diff > 0
      array_trunc << num[diff..-1]
    else
      array_trunc << num
    end
  end

  array_trunc.each do |numt|
    for i in 0..numt.length-1 do
      if numt[i] == "0"
        number[i] = 0
      end
    end
  end

  number = number.join("")

  return number.to_i(2)
end

p bitwise(12,15)
p bitwise(2,3)
p bitwise(8,13)