After reviewing whether a number is prime using the Or Boolean statement, the results are unexpected. Instead of completing the check and returning only prime numbers, the function returns the entire array.
function sumPrimes(num) {
var arr = [];
var prime;
for(var i = 1; i <=num; i++){
if(i%2 !== 0 || i%3 !== 0 || i%5 !== 0){
arr.push(i);
}
}
return arr;
}
sumPrimes(10);
If you're looking for an efficient way to find prime numbers, consider using a custom prime number algorithm like this:
function findPrimes(limit) {
var sieve = [], index, multiple, primes = [];
for (index = 2; index <= limit; ++index) {
if (!sieve[index]) {
// Found a prime number
primes.push(index);
for (multiple = index << 1; multiple <= limit; multiple += index) {
sieve[multiple] = true;
}
}
}
return primes;
}
You can then calculate the sum of these prime numbers efficiently using the reduce method
var calculateSumOfPrimes = function(number) {
var primesList = findPrimes(number)
var sum = primesList.reduce(function(total, primeNum) {
return total + primeNum
}, 0)
}
The desired logic can be achieved using one of the following conditions:
if (i%2 !== 0 && i%3 !== 0 && i%5 !== 0) // not divisible by 2, 3, or 5
// and not divisible by 5
or
if (!(i%2 === 0 || i%3 === 0 || i%5 === 0)) // not divisible by 2, 3, or 5
Note that this logic is applicable for prime numbers up to 48.
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