NodeJS Worker thread example

main.js

const {Worker, isMainThread, parentPort, workerData} = require('worker_threads')

// Returns if the script runs in main thread of in worker
if (isMainThread) {
	const arr = [[1, 10],[2, 15],[3, 21],[4, 25],[5, 86]]

	for (const ele of arr) {
		const worker = new Worker(__filename, {workerData: {a: ele[0], b: ele[1]}})
		worker.on('message', (result) => {
			console.log(`The sum of ${ele[0]} and ${ele[1]} is ${result}`)
		})

		worker.on('error', (err) => {
			console.log(`Some error occured in summing up ${ele[0]} and ${ele[1]}`)
		})

		worker.on('exit', (code) => {
			// if the returned code is zero, then the worker has closed without any error. So it can be neglected.
			if (code !== 0) {
				console.log(`Worker got closed unexpectedly in summing up ${ele[0]} and ${ele[1]} with code ${code}`)
			}
		})
	}
} else {
	parentPort.postMessage(workerData.a + workerData.b)
}