Node.js · Theory

Difference between NodeEventTarget and EventEmitter in Node.js

Theory

547/723

Difference between NodeEventTarget and EventEmitter in Node.js

Difference between NodeEventTarget and EventEmitter (in) is a Node.js topic. In plain words you use it for notify ‘saved’ in a small service. Don’t start with a slogan — start with that picture.

Smallest example: emitter.on / emit. Type it, run it, and say what you see. If you can do that from memory, you know Difference between NodeEventTarget and EventEmitter (in).

From the example next to this theory — Difference between NodeEventTarget and EventEmitter in Node.

Trap — too many listeners warning ignored. Fix that before you talk about advanced Node.js.

Viva: what is Difference between NodeEventTarget and EventEmitter (in)? Then show emitter.on / emit. Then name the trap.

Exam tip

What is Difference between NodeEventTarget and EventEmitter (in)? Show this: emitter.on / emit. Trap: too many listeners warning ignored.

Example

// Difference between NodeEventTarget and EventEmitter in Node.js
const users = [
  { id: 1, name: "Asha" },
  { id: 2, name: "Ravi" },
];

function findUser(id) {
  return users.find((u) => u.id === id) ?? null;
}

console.log(findUser(2));
console.log(users.map((u) => u.name));

Difference between NodeEventTarget and EventEmitter in Node.js: find user 2, then list names. Say both prints.

Short notes

DefDifference between NodeEventTarget and EventEmitter (in) — notify ‘saved’ in a small service.
Ruleemitter.on / emit
Traptoo many listeners warning ignored
Usea small service

// Difference between NodeEventTarget and EventEmitter in Node.js const users = [ { id: 1, name: "Asha" }, { id: 2, name: "Ravi" }, ]; function findUser(id) { return users.find((u) => u.id === id) ?? null; } console.log(findUser(2)); console.log(users.map((u) => u.name));

Difference between NodeEventTarget and EventEmitter in Node.js

Example

Short notes

Questions

Difference between NodeEventTarget and EventEmitter in Node.js

Example

Short notes

Questions