[SPOILERS] Sum All Odd Fibonacci Numbers Using 3 lines of code!

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    function sumFibs(n, a = 0, b = 1) {
      if (a > n) return 0;
      if (a % 2 !== 0) return a + sumFibs(n, a + b, a);
      else return 0 + sumFibs(n, a + b, a);
    }
    sumFibs(10); //1 + 1 + 3 + 5 = 10
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I wrapped your solution in spoiler tags, so as not to just give it away :slight_smile:

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