Euler Project in Ruby - Problem 2

euler2.rb

# Create Fibonnaci Array
a = [1,2]
upto = 4_000_000
while a[-2] + a[-1] < upto
  a << a[-2] + a[-1] 
end
 
# Create sum of even Fibonnaci numbers
sum = 0
a.each { |x| sum+= x if x.even? }
 
puts "The result is #{sum}"

Here's my solution. Personally find it easier to understand than the one given

a = 0 #first fibonnaci number
b = 1 #second fibonnaci number
c = 0 #current fibonnaci number
sumevens = 0 #sum of even fibonnaci numbers less than 4,000,000

while c <= 4000000
    c = a + b
    a = b
    b = c
    sumevens += c if c % 2 == 0 
end

puts sumevens