Node.js · Theory

Buffers

Theory

20/723

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.

Exam tip

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

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.

Short notes

DefBuffers — read a big CSV in an upload job.
RulecreateReadStream
Traploading the whole file into RAM
Usean upload job

Node.js · Theory

Buffers

← All stacks

Theory

20/723

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.

Exam tip

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

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.

Short notes

DefBuffers — read a big CSV in an upload job.
RulecreateReadStream
Traploading the whole file into RAM
Usean upload job

Buffers

Example

Short notes

Questions

Buffers

Example

Short notes

Questions