Node fs.appendFile() — Node.js Technical Interview Questions & Answers

Node fs.appendFile()

Node fs.appendFile()

  • Node fs.appendFile() (function) is a Node.js topic. In plain words you use it for read a big CSV in an upload job. Don’t start with a slogan — start with that picture.
  • Smallest example: createReadStream. Type it, run it, and say what you see. If you can do that from memory, you know Node fs.appendFile() (function).
  • From the example next to this theory: Node fs.appendFile() — fs reads/writes files. Prefer promises/async APIs in real apps..
  • Trap: loading the whole file into RAM. Fix that before you talk about advanced Node.js.
  • Viva: what is Node fs.appendFile() (function)? Then show createReadStream. Then name the trap.

Technical Interview Tip: What is Node fs.appendFile() (function)? Show this: createReadStream. Trap: loading the whole file into RAM.

Code Examples for Node fs.appendFile()

Node fs.appendFile() — working 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);

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

How to Explain Node fs.appendFile() to an Interviewer

What is Node fs.appendFile() (function)?

Used for read a big CSV an upload job Not just the heading

Give one small example of Node fs.appendFile() (function).

createReadStream Node fs.appendFile() — fs reads/writes files. Prefer promises/async APIs in real apps.

What mistake do beginners make with Node fs.appendFile() (function)?

loading the whole file into RAM Show the fix

Where do you use Node fs.appendFile() (function)?

an upload job read a big CSV