Calculating prime numbers using Sieve of Eratosthenes

sieve.js

// https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
var sieve = [];
var primes = [];
var i, j;
var end = 1000;

for(i=2; i <= end; i++) {
  if (!sieve[i]) {
    primes.push(i);
      
    for(j = i*2; j <= end; j += i) {
      sieve[j] = true;
    }
  }
}

console.log(primes.join(', '));