Worker Thread in Node.js

 index.js

const {Worker} = require("worker_threads");

let number = 10;

const worker = new Worker("./myWorker.js", {workerData: {num: number}});

worker.once("message", result => {

console.log(`${number}th Fibonacci No: ${result}`);

});

worker.on("error", error => {

console.log(error);

});

worker.on("exit", exitCode => {

console.log(`It exited with code ${exitCode}`);

})

console.log("Execution in main thread");

-------------------------------------------------------------------------

myWorker.js

const { parentPort, workerData } = require("worker_threads");

parentPort.postMessage(getFibonacciNumber(workerData.num))

function getFibonacciNumber(num) {

if (num === 0) {

return 0;

}

else if (num === 1) {

return 1;

}

else {

return getFibonacciNumber(num - 1) + getFibonacciNumber(num - 2);

}

}

Output:

Execution in main thread 10th Fibonacci No: 55 It exited with code 0