Worker Threads in Node.js

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

if (isMainThread) {
  // Main thread code
  const worker = new Worker(__filename, {
    workerData: { iterations: 1000000 }
  })
  
  worker.on('message', (result) => {
    console.log('Result:', result)
  })
  
  worker.on('error', (err) => {
    console.error('Worker error:', err)
  })
  
  worker.postMessage({ cmd: 'START' })
} else {
  // Worker thread code
  parentPort.on('message', (msg) => {
    if (msg.cmd === 'START') {
      // CPU-intensive task
      let result = 0
      for (let i = 0; i < workerData.iterations; i++) {
        result += Math.sqrt(i)
      }
      parentPort.postMessage(result)
    }
  })
}