Summing Prime numbers

JavaScript
1

Tell us what’s happening:
Here is my code for summing prime numbers up to a given number but its not passing the tests and I don’t understand why. Please help

Your code so far


function sumPrimes(num) {
var sums = 0;
for(var i = 2; i <= num; i++);
if(isPrime(i)){
  return sums += i;

}
return sums;
}

sumPrimes(10);

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Challenge: Sum All Primes

Link to the challenge:

2

What is isPrime? Without knowing how you’ve defined that function, we can’t see what the issue is

2 Likes
3

You need a method of determining if a number is prime or not.

4

Ok i have done this: @cherylm @DanCouper

function sumPrimes(num) {
 var sums = 0;
function isPrime(num) {
  for(var i = 2; i < num; i++)
    if(num % i === 0) return false;
  return num > 1;
}

for(var i = 2; i <= num; i++);
if(isPrime(i)){
  return sums += i;

}
return sums;
}

sumPrimes(10);
5

I didn’t analyze your logic or run the code, but the first thing I noticed is you seem to have syntax errors with your for loops.

6

what is this return statement doing?