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Node.js · Theory

fs.stat() Method

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Theory

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fs.stat() Method

fs.stat() Method is a Node.js idea you prove with read a big CSV, not with a slogan.

fs.stat() Method order — meaning → createReadStream → one limit. Dumping ten features helps nobody.

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

Dev ships fs.stat() Method in an upload job. That is the use case worth saying.

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

After fs.stat() Method, Dev should still remember loading the whole file into RAM.

One breath for fs.stat() Method, then read a big CSV, then loading the whole file into RAM. Sit down.

Exam tip

Board: read a big CSV. Dry-run fs.stat() 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.stat() Method — fs reads/writes files. Prefer promises/async APIs in real apps.

Short notes

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

Questions

1

Define fs.stat() Method without jargon. Then point at read a big CSV.

2

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

3

What trap does Dev hit with fs.stat() Method?

4

Change one input on read a big CSV. Predict the new result.

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