Node.js · Theory

Pub/Sub in Node.js

Theory

375/723

Pub/Sub in Node.js

Pub/Sub (in node js) is a Node.js topic. In plain words you use it for a short Pub/Sub in node js example in a script or API on localhost. Don’t start with a slogan — start with that picture.

Smallest example: the smallest Pub/Sub in node js example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Pub/Sub (in node js).

From the example next to this theory — Pub/Sub in Node.

Trap — only saying “Pub/Sub in node js” with no example. Fix that before you talk about advanced Node.js.

Viva — what is Pub/Sub (in node js)? Then show the smallest Pub/Sub in node js example you can type. Then name the trap.

Exam tip

What is Pub/Sub (in node js)? Show this: the smallest Pub/Sub in node js example you can type. Trap: only saying “Pub/Sub in node js” with no example.

Example

// Pub/Sub 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));

Pub/Sub in Node.js: find user 2, then list names. Say both prints.

Short notes

DefPub/Sub (in node js) — a short Pub/Sub in node js example in a script or API on localhost.
Rulethe smallest Pub/Sub in node js example you can type
Traponly saying “Pub/Sub in node js” with no example
Usea script or API on localhost

Node.js · Theory

Pub/Sub in Node.js

← All stacks

Theory

375/723

Pub/Sub in Node.js

Pub/Sub (in node js) is a Node.js topic. In plain words you use it for a short Pub/Sub in node js example in a script or API on localhost. Don’t start with a slogan — start with that picture.

Smallest example: the smallest Pub/Sub in node js example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Pub/Sub (in node js).

From the example next to this theory — Pub/Sub in Node.

Trap — only saying “Pub/Sub in node js” with no example. Fix that before you talk about advanced Node.js.

Viva — what is Pub/Sub (in node js)? Then show the smallest Pub/Sub in node js example you can type. Then name the trap.

Exam tip

What is Pub/Sub (in node js)? Show this: the smallest Pub/Sub in node js example you can type. Trap: only saying “Pub/Sub in node js” with no example.

Example

// Pub/Sub 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));

Pub/Sub in Node.js: find user 2, then list names. Say both prints.

Short notes

DefPub/Sub (in node js) — a short Pub/Sub in node js example in a script or API on localhost.
Rulethe smallest Pub/Sub in node js example you can type
Traponly saying “Pub/Sub in node js” with no example
Usea script or API on localhost

Pub/Sub in Node.js

Example

Short notes

Questions

Pub/Sub in Node.js

Example

Short notes

Questions