My original solution (Ruby)
a, b, sum = 1, -1, 0 while a <= 4_000_000 a, b = a+b, a sum += a if a.even? end sum # => 4613732
I also thought it would be fun to try it as a lazy enumerator, though I still like my original solution better.
a, b = 1, -1 loop.lazy .map { a, b = a+b, a; a } .take_while { |n| n <= 4_000_000 } .select(&:even?) .sum # => 4613732
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My original solution (Ruby)
I also thought it would be fun to try it as a lazy enumerator, though I still like my original solution better.