quiz1i_ex6.rb

# Alyssa was asked to write an implementation of a rolling buffer. Elements are added to the rolling buffer and if the buffer becomes full, then new elements that are added will displace the oldest elements in the buffer.

=begin
She wrote two implementations saying, "Take your pick. Do you like << or + for modifying the buffer?". Is there a difference between the two, other than what operator she chose to use to add an element to the buffer?  Yes, there is a difference. While both methods have the same return value, in the first implementation, the input argument called buffer will be modified and will end up being changed after rolling_buffer1 returns. That is, the caller will have the input array that they pass in be different once the call returns. In the other implementation, rolling_buffer2 will not alter the caller's input argument.

=end
numbers = [1, 2, 3, 4]

def rolling_buffer1(buffer, max_buffer_size, new_element)
  
  buffer << new_element
  buffer.shift if buffer.size >= max_buffer_size
  puts buffer
end

rolling_buffer1(numbers, 8, 5)

def rolling_buffer2(input_array, max_buffer_size, new_element)

  buffer = input_array + [new_element]
  buffer.shift if buffer.size >= max_buffer_size
 puts buffer
end

rolling_buffer2(numbers, 2, 1)