putting two numbers into an array and have to count the numbers in between the upper and lower bound numbers.

Count the numbers in an array between a given range.rb

# count_between is a method with three arguments:
#   1. An array of integers
#   2. An integer lower bound
#   3. An integer upper bound
#
# It returns the number of integers in the array between the lower and upper bounds,
# including (potentially) those bounds.
#
# If +array+ is empty the method should return 0
def count_between(array, lower_bound, upper_bound)
  array << lower_bound << upper_bound

  disc = array.sort.index(lower_bound.to_i)
  drive = array.sort.index(upper_bound.to_i)

  if lower_bound > upper_bound
    return 0 
  elsif lower_bound == array.sort.first and upper_bound == array.sort.last
    return array.length - 2
  elsif (lower_bound != array.sort.first and upper_bound == array.sort.last) || (lower_bound == array.sort.first and upper_bound != array.sort.last)
    return drive - disc - 1
  end

end


puts count_between([], -100, 100)