Node.js · Theory

Readline.clearScreenDown(stream[, callback]) method in Node.js

Theory

520/723

Readline.clearScreenDown(stream[, callback]) method in Node.js

Readline.clearScreenDown(stream[, callback]) method (node js) is a Node.js topic. In plain words you use it for read notes.txt in a script. Don’t start with a slogan — start with that picture.

Smallest example: (err, data) => …. Type it, run it, and say what you see. If you can do that from memory, you know Readline.clearScreenDown(stream[, callback]) method (node js).

From the example next to this theory: Readline.clearScreenDown(stream[, callback]) method in Node.js — fs reads/writes files. Prefer promises/async APIs in real apps..

Trap — callback hell, no error-first. Fix that before you talk about advanced Node.js.

Viva: what is Readline.clearScreenDown(stream[, callback]) method (node js)? Then show (err, data) => …. Then name the trap.

Exam tip

What is Readline.clearScreenDown(stream[, callback]) method (node js)? Show this: (err, data) => …. Trap: callback hell, no error-first.

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);

Readline.clearScreenDown(stream[, callback]) method in Node.js — fs reads/writes files. Prefer promises/async APIs in real apps.

Short notes

DefReadline.clearScreenDown(stream[, callback]) method (node js) — read notes.txt in a script.
Rule(err, data) => …
Trapcallback hell, no error-first
Usea script

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);

Readline.clearScreenDown(stream[, callback]) method in Node.js

Example

Short notes

Questions

Readline.clearScreenDown(stream[, callback]) method in Node.js

Example

Short notes

Questions