Buffers — Node.js Technical Interview Questions & Answers

Buffers

Buffers

  • Buffers 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 Buffers.
  • From the example next to this theory: Buffers: find user 2, then list names.
  • Trap: loading the whole file into RAM. Fix that before you talk about advanced Node.js.
  • Viva: what is Buffers? Then show createReadStream. Then name the trap.

Technical Interview Tip: What is Buffers? Show this: createReadStream. Trap: loading the whole file into RAM.

Code Examples for Buffers

Buffers — working example

// Buffers
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));

Buffers: find user 2, then list names. Say both prints.

How to Explain Buffers to an Interviewer

What is Buffers?

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

Give one small example of Buffers.

createReadStream Buffers: find user 2, then list names

What mistake do beginners make with Buffers?

loading the whole file into RAM Show the fix

Where do you use Buffers?

an upload job read a big CSV