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Node.js · Theory

process.finalization.registerBeforeExit(ref, callback) in Node.js

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Theory

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process.finalization.registerBeforeExit(ref, callback) in Node.js

Don’t start process.finalization.registerBeforeExit(ref, callback) (node) with jargon. Start with read notes.txt. That is the whole point.

process.finalization.registerBeforeExit(ref, callback) (node) on the board: (err, data) => …. Then say what read notes.txt looks like after.

Without process.finalization.registerBeforeExit(ref, callback) (node), a script gets messy and read notes.txt is hard to trust.

process.finalization.registerBeforeExit(ref, callback) (node) shows up in a script. Name read notes.txt, not “a real-world scenario”.

process.finalization.registerBeforeExit(ref, callback) (node) trap: callback hell, no error-first. Kabir loses marks for that every viva.

After process.finalization.registerBeforeExit(ref, callback) (node), Kabir should still remember callback hell, no error-first.

Viva for process.finalization.registerBeforeExit(ref, callback) (node): what it is → (err, data) => … → the mistake (callback hell, no error-first).

Exam tip

For process.finalization.registerBeforeExit(ref, callback) (node): definition + a script + one failure.

Example

function wait(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

(async () => {
  console.log("start");
  await wait(50);
  console.log("done");
})();

process.finalization.registerBeforeExit(ref, callback) in Node.js — async/await sits on Promises — cleaner than nested callbacks.

Short notes

  • Defprocess.finalization.registerBeforeExit(ref, callback) (node) — Kabir uses it for read notes.txt in a script.
  • Ruleprocess.finalization.registerBeforeExit(ref, callback) (node) → (err, data) => ….
  • Rememberprocess.finalization.registerBeforeExit(ref, callback) (node) + npm (a script).
  • Useprocess.finalization.registerBeforeExit(ref, callback) (node) in a script (read notes.txt).
  • Trapprocess.finalization.registerBeforeExit(ref, callback) (node) — callback hell, no error-first.
  • Exprocess.finalization.registerBeforeExit(ref, callback) (node) → read notes.txt.

Questions

1

In one breath: what does process.finalization.registerBeforeExit(ref, callback) (node) do for Kabir?

2

Where does process.finalization.registerBeforeExit(ref, callback) (node) show up in a script?

3

What trap does Kabir hit with process.finalization.registerBeforeExit(ref, callback) (node)?

4

Write the smallest process.finalization.registerBeforeExit(ref, callback) (node) step on read notes.txt. What happens?

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