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Node.js · Theory

fs.lstatSync() Method

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Theory

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fs.lstatSync() Method

Don’t start fs.lstatSync() Method with jargon. Start with read a big CSV. That is the whole point.

Do fs.lstatSync() Method once by hand. createReadStream. Change one input. Say the new result out loud.

fs.lstatSync() Method exists so Kabir can keep read a big CSV correct in an upload job.

Use fs.lstatSync() Method when read a big CSV must stay clear. If a simpler Node.js step works, use that instead.

fs.lstatSync() Method trap — loading the whole file into RAM. Kabir loses marks for that every viva.

fs.lstatSync() Method is not a lonely heading. Kabir ties it to read a big CSV.

Viva for fs.lstatSync() Method — what it is → createReadStream → the mistake (loading the whole file into RAM).

Exam tip

For fs.lstatSync() Method: definition + an upload job + one failure.

Example

const fs = require("fs");
const path = require("path");

const file = path.join(__dirname || ".", "demo.txt");
fs.writeFileSync(file, "hello node\n");
const text = fs.readFileSync(file, "utf8");
console.log(text.trim());
fs.unlinkSync(file);

fs.lstatSync() Method — fs reads/writes files. Prefer promises/async APIs in real apps.

Short notes

  • Deffs.lstatSync() Method — Kabir uses it for read a big CSV in an upload job.
  • Rulefs.lstatSync() Method → createReadStream.
  • Rememberfs.lstatSync() Method + npm (an upload job).
  • Usefs.lstatSync() Method in an upload job (read a big CSV).
  • Trapfs.lstatSync() Method — loading the whole file into RAM.
  • Exfs.lstatSync() Method → read a big CSV.

Questions

1

In one breath: what does fs.lstatSync() Method do for Kabir?

2

Where does fs.lstatSync() Method show up in an upload job?

3

How do you catch loading the whole file into RAM?

4

Dry-run createReadStream and say the result.

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