Project Euler N° 2, in Ruby

http://projecteuler.net/index.php?section=problems&id=2

Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...

By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

def fib(limit)
 f_n_1 = 1
 f_n_2 = 1
 curr = [1,1]
 while (f_n_1 + f_n_2) <= limit
  curr.push(f_n_1 + f_n_2)
  f_n_2 = f_n_1
  f_n_1 = curr.last
 end
 return curr
end

Limit = 4000000
allFib = fib(Limit)
iter = allFib.size/3
puts allFib
puts iter

sum = 0
for i in 0..iter
 if i*3 + 2 > allFib.size
  break
 end
 sum += allFib[i*3 + 2]
end

puts sum