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Node.js · Theory

File System

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Theory

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File System

Don’t start File System with jargon. Start with a File System dry-run. That is the whole point.

Keep File System small. Kabir should finish a File System dry-run in a few lines, not a 40-line dump.

Without File System, a campus project gets messy and a File System dry-run is hard to trust.

Use File System when a File System dry-run must stay clear. If a simpler Node.js step works, use that instead.

If a File System dry-run breaks under File System, check only reciting the name of File System first.

After File System, Kabir should still remember only reciting the name of File System.

One breath for File System, then a File System dry-run, then only reciting the name of File System. Sit down.

Exam tip

Say File System in one breath, then one File System step Kabir can write from memory, then only reciting the name of File System.

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);

File System — fs reads/writes files. Prefer promises/async APIs in real apps.

Short notes

  • DefFile System — Kabir uses it for a File System dry-run in a campus project.
  • RuleFile System → one File System step Kabir can write from memory.
  • RememberFile System + npm (a campus project).
  • UseFile System in a campus project (a File System dry-run).
  • TrapFile System — only reciting the name of File System.
  • ExFile System → a File System dry-run.

Questions

1

In one breath: what does File System do for Kabir?

2

Name one Node.js screen/job that needs File System.

3

Which mistake makes a File System dry-run fail?

4

Change one input on a File System dry-run. Predict the new result.

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