euler/ruby/euler002.rb

17 lines
270 B
Ruby

def even_fibonacci_up_to(n)
Enumerator.new do |y|
a = 0
b = 1
loop do
temp = b
b = a + b
a = temp
y << b
end
end.take_while { |i| i < n }.select { |i| i.even? }
end
def solution
even_fibonacci_up_to(4000000).inject(:+)
end