Please explain why my code is not returning result. Thank you.
Your code so far
let result=0;
function sumPrimes(num) {
function isPrime(x){
for (let i=2;i<x;i++){
if (x%i==0&&x!==i ){
return false;
}
}
return true;
}
if (isPrime(num)){
result+=num;
}
if (num==2){
console.log(result)
return result;
}
sumPrimes(num-1);
}
sumPrimes(977);
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You have at least three distinct problems. (The first one I list isn’t technically a deal breaker, but it will help you debug the other two.)
The “output” you are seeing is from your console.log not the actual return value. I suggest you fix this FIRST as it will make solving the other problems a whole lot easier.
The second problem is that you aren’t actually returning anything from sumPrimes. So, I’d tackle that next.
And your result is global, which is causing subsequent runs to start at the wrong spot. But I wouldn’t deal with that until you’re returning and logging out the current results of sumPrimes.
I also had a hard time reading your code the way it was formatted. Here’s a version that was easier for me to read, with some comments that might be useful,
let result = 0; // having this on the global context is causing you problems
function sumPrimes(num) {
function isPrime(x){
for (let i = 2; i < x; i++){
if (x % i == 0 && x !== i ){
return false;
}
}
return true;
}
if (isPrime(num)){
result += num;
}
if (num == 2){
// I think this console.log was throwing you off
// console.log(result)
return result;
}
sumPrimes(num-1); // you need to return something here ;-)
}
// Logging out like this will let you see what's actually being returned
console.log(sumPrimes(10))
console.log(sumPrimes(10))
Here’s a version that was easier for me to read, with some comments that might be useful,