worker-array.js

let numberOfThreads = 10;
const workerArray = [];
for (let n = 0; n < numberOfThreads; n++) {
    workerArray.push(new Worker("./project_modules/worker.js"))
}
let i = 0;
const worker_array_calculus = (num,threads) => {
    return new Promise((resolve, reject) => {
        let workerNum = i % threads;
        console.log('worker num:', workerNum)
        workerArray[workerNum].on("message", result => {
            resolve(result.output)
        });
        workerArray[workerNum].postMessage({num: num});
        i++;
    })
}

Related to medium article: https://gae-piaz.medium.com/achieve-the-best-performance-10x-faster-node-js-with-worker-threads-97fc2890e40f