This gist demonstrates the node.js worker threads example by simulating a time-consuming task.

node-js-worker-threads-example.js

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

if (isMainThread) {
  console.log("Main thread started.");

  // Create a new worker thread
  const worker = new Worker(__filename);

  // Listen for messages from the worker thread
  worker.on("message", (result) => {
    console.log("Result from worker:", result);

    // Terminate the worker thread
    worker.terminate();

    console.log("Main thread finished.");
  });
} else {
  // Worker thread logic
  console.log("Worker thread started.");

  // Simulate a time-consuming task
  const simulateTask = () => {
    console.log("simulateTask ~ simulating a long running task");
    const startTime = Date.now();
    let result = [];
    for (let i = 0; i < 300000; i++) {
      result.unshift(i);
    }
    return {
      result,
      totalExecutionTime: `${(Date.now() - startTime) / 1000} seconds`,
    };
  };

  // Perform the time-consuming task
  const result = simulateTask();

  // Send the result back to the main thread
  parentPort.postMessage(result);

  console.log("Worker thread finished.");
}