Blocking and Non-Blocking in Node.js — Node.js Technical Interview Questions & Answers

Blocking and Non-Blocking in Node.js

Blocking and Non-Blocking in Node.js

  • Blocking and Non-Blocking (node js) is a Node.js topic. In plain words you use it for wait for DB then reply in one Node process. Don’t start with a slogan — start with that picture.
  • Smallest example: async I/O, don’t block. Type it, run it, and say what you see. If you can do that from memory, you know Blocking and Non-Blocking (node js).
  • From the example next to this theory: Blocking and Non-Blocking in Node.
  • Trap: fs.readFileSync on a huge file. Fix that before you talk about advanced Node.js.
  • Viva: what is Blocking and Non-Blocking (node js)? Then show async I/O, don’t block. Then name the trap.

Technical Interview Tip: What is Blocking and Non-Blocking (node js)? Show this: async I/O, don’t block. Trap: fs.readFileSync on a huge file.

Code Examples for Blocking and Non-Blocking in Node.js

Blocking and Non-Blocking in Node.js — working example

// Blocking and Non-Blocking in Node.js
const users = [
  { id: 1, name: "Asha" },
  { id: 2, name: "Ravi" },
];

function findUser(id) {
  return users.find((u) => u.id === id) ?? null;
}

console.log(findUser(2));
console.log(users.map((u) => u.name));

Blocking and Non-Blocking in Node.js: find user 2, then list names. Say both prints.

How to Explain Blocking and Non-Blocking in Node.js to an Interviewer

What is Blocking and Non-Blocking (node js)?

Used for wait for DB then reply one Node process Not just the heading

Give one small example of Blocking and Non-Blocking (node js).

async I/O, don’t block Blocking and Non-Blocking in Node

What mistake do beginners make with Blocking and Non-Blocking (node js)?

fs.readFileSync on a huge file Show the fix

Where do you use Blocking and Non-Blocking (node js)?

one Node process wait for DB then reply