here sum all fibonacci terms that are even: `def fibona(n) return n if n < 2 fib_sequence = [1, 1] (1...n).each do |_| fib_sequence << fib_sequence[-1] + fib_sequence[-2] end fib_sequence end` in ruby

main.rb
def fibona(n)
  return n if n < 2
  
  fib_sequence = [1, 1]
  
  (1...n).each do |_|
    next_fib = fib_sequence[-1] + fib_sequence[-2]
    fib_sequence << next_fib
    
    # Add only the even Fibonacci terms to the sum
    fib_sequence[-2] % 2 == 0 ? fib_sequence[-2] : 0
  end
  
  # Calculate the sum of all even Fibonacci terms
  even_sum = fib_sequence.select { |num| num.even? }.sum
  
  even_sum
end
409 chars
19 lines

main.rb
fib_result = fibona(10)
puts fib_result  # Output: 44
54 chars
3 lines