Node.js · Theory

Events

Theory

30/723

Events

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

Smallest example: the smallest Events example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Events.

From the example next to this theory — Events: find user 2, then list names.

Trap — only saying “Events” with no example. Fix that before you talk about advanced Node.js.

Viva — what is Events? Then show the smallest Events example you can type. Then name the trap.

Exam tip

What is Events? Show this: the smallest Events example you can type. Trap: only saying “Events” with no example.

Example

// Events
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));

Events: find user 2, then list names. Say both prints.

Short notes

DefEvents — a short Events example in a script or API on localhost.
Rulethe smallest Events example you can type
Traponly saying “Events” with no example
Usea script or API on localhost

Node.js · Theory

Events

← All stacks

Theory

30/723

Events

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

Smallest example: the smallest Events example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Events.

From the example next to this theory — Events: find user 2, then list names.

Trap — only saying “Events” with no example. Fix that before you talk about advanced Node.js.

Viva — what is Events? Then show the smallest Events example you can type. Then name the trap.

Exam tip

What is Events? Show this: the smallest Events example you can type. Trap: only saying “Events” with no example.

Example

// Events
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));

Events: find user 2, then list names. Say both prints.

Short notes

DefEvents — a short Events example in a script or API on localhost.
Rulethe smallest Events example you can type
Traponly saying “Events” with no example
Usea script or API on localhost

Events

Example

Short notes

Questions

Events

Example

Short notes

Questions