**Tell us what’s happening:**

I’m trying to do the assignment : given a positive integer `num`

, return the sum of all odd Fibonacci numbers that are less than or equal to `num`

.

The below code seems to be working for small values, but the tests on large values are failing. What’s happening?

**Your code so far**

```
function sumFibs(num) {
let arr = [1, 1];
let i = 0;
while(arr.length < num) {
arr.push(arr[i] + arr[i+1]);
i++;
}
let arrSum = arr.reduce(function(sum, val){
if(val % 2 !== 0) {
return sum + val;
} else {
return sum;
}
});
return arrSum;
}
sumFibs(4);
```

**Your browser information:**

User Agent is: `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.5 Safari/605.1.15`

.

**Challenge:** Sum All Odd Fibonacci Numbers

**Link to the challenge:**

https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers