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Node.js · Theory

fs.futimesSync() Method

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Theory

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fs.futimesSync() Method

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

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

Skip fs.futimesSync() Method and loading the whole file into RAM shows up in an upload job.

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

fs.futimesSync() Method miss — loading the whole file into RAM. Fix it before you talk about advanced Node.js.

Place fs.futimesSync() Method next to nearby Node.js work — createReadStream is the link.

Close fs.futimesSync() Method with: “If I skip it, read a big CSV goes wrong like this: loading the whole file into RAM.”

Exam tip

Board: read a big CSV. Dry-run fs.futimesSync() Method. Name the trap: loading the whole file into RAM.

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

Short notes

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

Questions

1

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

2

Name one Node.js screen/job that needs fs.futimesSync() Method.

3

What trap does Kabir hit with fs.futimesSync() Method?

4

Write the smallest fs.futimesSync() Method step on read a big CSV. What happens?

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