**Tell us what’s happening:**

I managed to pass the test with the code below. I checked the official guide and it was totally way off from the solutions provided.

Coding/function wise would this be acceptable? I supposed this is inefficient and execution error may occur?

```
function sumPrimes(num) {
let sum = 0;
for (let i = num; i > 1; i--) { // iterate starting from i = num to 2)
let n = i-1;
while (i % n !== 0 && n > 1) {
n--; // while loop to test if i is prime
} // i is prime if while statement loops completely
if (n == 1) { // n == 1 if while executes all the way
sum +=i;
}
}
return sum;
}
sumPrimes(10);
```

**Your browser information:**

User Agent is: `Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36`

.

**Link to the challenge:**

https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes/