Comprehensive Ruby Programming

Implementing an even Fibonacci number algorithm

In this section, we are going to solve a mathematical challenge that asks us to find even Fibonacci numbers. The full question is: by considering the terms in the Fibonacci sequence whose values do not exceed 4 million, find the sum of the even-valued terms.

Since this is a fairly straightforward problem (assuming that you are familiar with the Fibonacci sequence), we're going to build a more exhaustive solution to further our understanding of Ruby. We're not going to write a one-line code answer for this problem; rather, we are going to build a class:

class Fibbing  def initialize(max)    @num_1 = 0    @i = 0    @sum = 0    @num_2 = 1    @max = max  end  def even_fibonacci    while @i<= @max @i = @num_1 + @num_2 ...