index.js

const js = require('./primes.js');
const addon = require('./build/Release/primes.node');

function run(i) {
    console.time('Prime in js');
    js.prime(i);
    console.timeEnd('Prime in js');

    console.time('Prime in addon');
    addon.prime(i);
    console.timeEnd('Prime in addon');
}

for(let i = 0; i < 1000000; i++) {
  run(i);
}