[Intermediate Algorithm Scripting: Sum All Odd Fibonacci Numbers | freeCodeCamp.org](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers)

```js function fibonacci(num) { let num1 = 0, num2 = 1, sum, i = 0 for (i = 0; i < num; i++) { sum = num1 + num2 num1 = num2 num2 = sum } return num2 }

function sumFibs(num) { let sum = 0 for (let i = 0; i < num; i++) { if (fibonacci(i) % 2 !== 0 && fibonacci(i) <= num) { sum += fibonacci(i) } } return sum }

sumFibs(10) // https://www.geeksforgeeks.org/fibonacci-series-program-in-javascript/ ```

答案

```js function sumFibs(num) { let prevNumber = 0 let currNumber = 1 let result = 0 while (currNumber <= num) { if (currNumber % 2 !== 0) { result += currNumber } currNumber += prevNumber prevNumber = currNumber - prevNumber }

return result } ```

```js function sumFibs(num) { // Perform checks for the validity of the input if (num <= 0) return 0

// Create an array of fib numbers till num const arrFib = [1, 1] let nextFib = 0

/ We put the new Fibonacci numbers to the front so we / don't need to calculate the length of the array on each // iteration while ((nextFib = arrFib[0] + arrFib[1]) <= num) { arrFib.unshift(nextFib) }

// We filter the array to get the odd numbers and reduce them to get their sum. return arrFib.filter((x) > x % 2 ! 0).reduce((a, b) => a + b) } ```