Node.js · Theory

perf_hooks.monitorEventLoopDelay([options]) function in Node.js

Theory

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perf_hooks.monitorEventLoopDelay([options]) function in Node.js

perf_hooks.monitorEventLoopDelay([options]) function (in node js) is simple if you keep it on paper. Meera uses it for wait for DB then reply in one Node process.

For perf_hooks.monitorEventLoopDelay([options]) function (in node js), npm is in play. Don’t blame it until you have traced wait for DB then reply.

perf_hooks.monitorEventLoopDelay([options]) function (in node js) exists so Meera can keep wait for DB then reply correct in one Node process.

perf_hooks.monitorEventLoopDelay([options]) function (in node js) shows up in one Node process. Name wait for DB then reply, not “a real-world scenario”.

Don’t do this with perf_hooks.monitorEventLoopDelay([options]) function (in node js): fs.readFileSync on a huge file. Interviewers spot it in ten seconds.

Place perf_hooks.monitorEventLoopDelay([options]) function (in node js) next to nearby Node.js work — async I/O, don’t block is the link.

One breath for perf_hooks.monitorEventLoopDelay([options]) function (in node js), then wait for DB then reply, then fs.readFileSync on a huge file. Sit down.

Exam tip

Board: wait for DB then reply. Dry-run perf_hooks.monitorEventLoopDelay([options]) function (in node js). Name the trap: fs.readFileSync on a huge file.

Example

// perf_hooks.monitorEventLoopDelay([options]) function 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));

perf_hooks.monitorEventLoopDelay([options]) function in Node.js: find user 2, then list names. Say both prints.

Short notes

Defperf_hooks.monitorEventLoopDelay([options]) function (in node js) — Meera uses it for wait for DB then reply in one Node process.
Ruleperf_hooks.monitorEventLoopDelay([options]) function (in node js) → async I/O, don’t block.
Rememberperf_hooks.monitorEventLoopDelay([options]) function (in node js) + npm (one Node process).
Useperf_hooks.monitorEventLoopDelay([options]) function (in node js) in one Node process (wait for DB then reply).
Trapperf_hooks.monitorEventLoopDelay([options]) function (in node js) — fs.readFileSync on a huge file.
Experf_hooks.monitorEventLoopDelay([options]) function (in node js) → wait for DB then reply.

// perf_hooks.monitorEventLoopDelay([options]) function 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));

perf_hooks.monitorEventLoopDelay([options]) function in Node.js

Example

Short notes

Questions

perf_hooks.monitorEventLoopDelay([options]) function in Node.js

Example

Short notes

Questions