Ruby solution for Project Euler problem 2

euler2.rb

# https://projecteuler.net/problem=2

puts "Find the sum of even valued Fibonnaci terms which values do not exceed:"
STDOUT.flush #clears the buffer
num = Integer(gets.chomp)

def fibonacci(max_num)
  fibonacci = [1,2] #first two numbers of the sequence
  while fibonacci[-2] + fibonacci[-1] < max_num
    fibonacci << fibonacci[-2] + fibonacci[-1] # next num in sequence
  end
  fibonacci #return
end

def sum_fibonacci(max_num)
  sum = 0
  fibonacci(max_num).each do |n|
    sum = sum + n if n.even? #Add if n is even
  end
  sum #return
end
 
puts "Sum of even Fibonacci numbers up to #{num} = " + sum_fibonacci(num).to_s