# Rewrite sumPrimes so it returns the sum of all prime numbers that are less than or equal to num

``````function sumPrimes(num) {

function isPrime(num) {

for (let i = 2; i <= Math.sqrt(num); i++) {

if (num % i == 0) {

return false;

}

}

return true;

}

let sum = 0;

for (let i = 2; i <= num; i++) {

if (isPrime(i)) {

sum += i;

}

}

return sum;

}

console.log(sumPrimes(4));
// 2, 3, 5, 7, 11, 13, 17.........

/*
Explanation :-

sp(4)

sum = 0

for i = 2 <= 4 true

if ip(2) --> now check in function

for i = 2 <= 1.414 false, return true

sum = 0 + 2, i++ in sp(num)

for i = 3 <= 4 true

if ip(3) --> check in function

for i = 2 <= 1.732 false, return true

sum = 2 + 3, i++ in sp(num)

for i = 4 <= 4 true

if ip(4) --> check in function

for i = 2 <= 2 true

if 4 % 2 == 0 true, return false, i++ in sp(num)

for i = 5 <= 4 false, return sum = 5 */
``````

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