Node.js · Theory

File System

Theory

22/723

File System

File System is a Node.js topic. In plain words you use it for a short File System example in a script or API on localhost. Don’t start with a slogan — start with that picture.

Smallest example: the smallest File System example you can type. Type it, run it, and say what you see. If you can do that from memory, you know File System.

From the example next to this theory — File System — fs reads/writes files.

Trap — only saying “File System” with no example. Fix that before you talk about advanced Node.js.

Viva — what is File System? Then show the smallest File System example you can type. Then name the trap.

Exam tip

What is File System? Show this: the smallest File System example you can type. Trap: only saying “File System” with no example.

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 — a short File System example in a script or API on localhost.
Rulethe smallest File System example you can type
Traponly saying “File System” with no example
Usea script or API on localhost

Node.js · Theory

File System

← All stacks

Theory

22/723

File System

File System is a Node.js topic. In plain words you use it for a short File System example in a script or API on localhost. Don’t start with a slogan — start with that picture.

Smallest example: the smallest File System example you can type. Type it, run it, and say what you see. If you can do that from memory, you know File System.

From the example next to this theory — File System — fs reads/writes files.

Trap — only saying “File System” with no example. Fix that before you talk about advanced Node.js.

Viva — what is File System? Then show the smallest File System example you can type. Then name the trap.

Exam tip

What is File System? Show this: the smallest File System example you can type. Trap: only saying “File System” with no example.

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 — a short File System example in a script or API on localhost.
Rulethe smallest File System example you can type
Traponly saying “File System” with no example
Usea script or API on localhost

File System

Example

Short notes

Questions

File System

Example

Short notes

Questions