Node.js · Theory

promiseHooks.onSettled(settled) in Node.js

Theory

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promiseHooks.onSettled(settled) in Node.js

promiseHooks.onSettled(settled) (in node js) sits in an API handler. Neha’s job is fetch a user then marks. Write that first.

Do promiseHooks.onSettled(settled) (in node js) once by hand. async function + try/catch. Change one input. Say the new result out loud.

Skip promiseHooks.onSettled(settled) (in node js) and unhandled rejection shows up in an API handler.

Use promiseHooks.onSettled(settled) (in node js) when fetch a user then marks must stay clear. If a simpler Node.js step works, use that instead.

promiseHooks.onSettled(settled) (in node js) trap: unhandled rejection. Neha loses marks for that every viva.

promiseHooks.onSettled(settled) (in node js) is not a lonely heading. Neha ties it to fetch a user then marks.

Viva for promiseHooks.onSettled(settled) (in node js): what it is → async function + try/catch → the mistake (unhandled rejection).

Exam tip

Say promiseHooks.onSettled(settled) (in node js) in one breath, then async function + try/catch, then unhandled rejection.

Example

// promiseHooks.onSettled(settled) 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));

promiseHooks.onSettled(settled) in Node.js: find user 2, then list names. Say both prints.

Short notes

DefpromiseHooks.onSettled(settled) (in node js) — Neha uses it for fetch a user then marks in an API handler.
RulepromiseHooks.onSettled(settled) (in node js) → async function + try/catch.
RememberpromiseHooks.onSettled(settled) (in node js) + the event loop (an API handler).
UsepromiseHooks.onSettled(settled) (in node js) in an API handler (fetch a user then marks).
TrappromiseHooks.onSettled(settled) (in node js) — unhandled rejection.
ExpromiseHooks.onSettled(settled) (in node js) → fetch a user then marks.

// promiseHooks.onSettled(settled) 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));

promiseHooks.onSettled(settled) in Node.js

Example

Short notes

Questions

promiseHooks.onSettled(settled) in Node.js

Example

Short notes

Questions