Data Structure exercise

datastructure.rb

class Array_List
  attr_accessor :initial_size, :list_size, :array_length, :content
  def initialize
    @initial_size = 10
    @list_size = 0
    @array_length = @initial_size
    @content = Array.new(@initial_size)
  end

  def append(element)
    if self.array_length == self.list_size
      self.content += Array.new(self.array_length)
      self.array_length *= 2
    end
    self.content[self.list_size] = element
    self.list_size += 1
  end

  def prepend(element)
    if self.array_length == self.list_size
      self.content += Array.new(self.array_length)
      self.array_length *= 2
    end
    
    # self.list_size.times do |i|
      
    # end


    self.list_size += 1
  end

  def get_element(index)
    if index >= self.list_size
      raise "No such element"
    else
      self.content[index]
    end
  end

  def set_element(index, element)
    if index >= self.list_size
      raise "Index out of bound"
    else
      self.content[index] = element
    end
    self.content
  end
end

#driver code:
array = Array_List.new

puts "List Size: #{array.list_size}"
puts "Array Length: #{array.array_length}"
p array.content

array.prepend('hi')
puts "List Size: #{array.list_size}"
puts "Array Length: #{array.array_length}"
p array.content

array.prepend('hi')
puts "List Size: #{array.list_size}"
puts "Array Length: #{array.array_length}"
p array.content