deepal

const EventEmitter = require('events');

const myEmitter = new EventEmitter();

myEmitter.on('myevent', () => console.log('handler1: myevent was fired!'));
myEmitter.on('myevent', () => console.log('handler2: myevent was fired!'));
myEmitter.on('myevent', () => console.log('handler3: myevent was fired!'));

myEmitter.emit('myevent');
console.log('I am the last log line');

deepal

function writeToMyFile(data, callback) {
    if (!data) {
        process.nextTick(() => callback(new Error('No data provided')));
    } else {
        fs.writeFile('myfile.txt', data, callback);
    }
}

deepal

function writeToMyFile(data, callback) {
    if (!data) {
        callback(new Error('No data provided'));
    } else {
        fs.writeFile('myfile.txt', data, callback);
    }
}

deepal

const sum = (a, b, callback) => {
  callback(a + b);
};

sum(1,2, (result) => {
  console.log(result);
});

deepal

const wait = () => new Promise((resolve) => {
    setTimeout(() => {}, 5000)
})(async () => {
    return wait();
})()

deepal

const wait = () => new Promise((resolve) => {
    setTimeout(() => {}, 5000)
})

const fn = (async () => {
    return wait();
})()

deepal

const wait = () => new Promise((resolve) => {
    setTimeout(() => {}, 5000)
})

(async () => {
    return wait();
})()

deepal

const publicWorker = require('worker_threads');

// ...redacted...

port.on('message', (message) => {
  if (message.type === 'loadScript') {
    const {
      cwdCounter,
      filename,
      doEval,

deepal

const kPublicPort = Symbol('kPublicPort');
// ...redacted...

const { port1, port2 } = new MessageChannel();
this[kPublicPort] = port1;
this[kPublicPort].on('message', (message) => this.emit('message', message));
// ...redacted...

this[kPort].postMessage({
  type: 'loadScript',

deepal

const {Worker, isMainThread, parentPort, workerData} = require('worker_threads');
if (isMainThread) {
 const worker = new Worker(__filename, {workerData: {num: 5}});
 worker.once('message', (result) => {
 console.log('square of 5 is :', result);
 })
} else {
 parentPort.postMessage(workerData.num * workerData.num)
}