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performance.eventLoopUtilization() in Node.js

Theory

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performance.eventLoopUtilization() in Node.js

If you can teach performance.eventLoopUtilization() (in node js) using wait for DB then reply, you know it. If you only know the heading, you don’t.

performance.eventLoopUtilization() (in node js) on the board: async I/O, don’t block. Then say what wait for DB then reply looks like after.

Skip performance.eventLoopUtilization() (in node js) and fs.readFileSync on a huge file shows up in one Node process.

Use performance.eventLoopUtilization() (in node js) when wait for DB then reply must stay clear. If a simpler Node.js step works, use that instead.

If wait for DB then reply breaks under performance.eventLoopUtilization() (in node js), check fs.readFileSync on a huge file first.

performance.eventLoopUtilization() (in node js) is not a lonely heading. Isha ties it to wait for DB then reply.

Viva for performance.eventLoopUtilization() (in node js): what it is → async I/O, don’t block → the mistake (fs.readFileSync on a huge file).

Exam tip

Board: wait for DB then reply. Dry-run performance.eventLoopUtilization() (in node js). Name the trap: fs.readFileSync on a huge file.

Example

// performance.eventLoopUtilization() 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));

performance.eventLoopUtilization() in Node.js: find user 2, then list names. Say both prints.

Short notes

Defperformance.eventLoopUtilization() (in node js) — Isha uses it for wait for DB then reply in one Node process.
Ruleperformance.eventLoopUtilization() (in node js) → async I/O, don’t block.
Rememberperformance.eventLoopUtilization() (in node js) + the event loop (one Node process).
Useperformance.eventLoopUtilization() (in node js) in one Node process (wait for DB then reply).
Trapperformance.eventLoopUtilization() (in node js) — fs.readFileSync on a huge file.
Experformance.eventLoopUtilization() (in node js) → wait for DB then reply.

// performance.eventLoopUtilization() 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));

performance.eventLoopUtilization() in Node.js

Example

Short notes

Questions

performance.eventLoopUtilization() in Node.js

Example

Short notes

Questions