Node.js · Theory

writeStream.clearLine() Method

Theory

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writeStream.clearLine() Method

writeStream.clearLine() Method 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 writeStream.clearLine() Method.

From the example next to this theory — writeStream.

Trap — loading the whole file into RAM. Fix that before you talk about advanced Node.js.

Viva — what is writeStream.clearLine() Method? Then show createReadStream. Then name the trap.

Exam tip

What is writeStream.clearLine() Method? Show this: createReadStream. Trap: loading the whole file into RAM.

Example

// writeStream.clearLine() Method
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));

writeStream.clearLine() Method: find user 2, then list names. Say both prints.

Short notes

DefwriteStream.clearLine() Method — read a big CSV in an upload job.
RulecreateReadStream
Traploading the whole file into RAM
Usean upload job

// writeStream.clearLine() Method 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));

writeStream.clearLine() Method

Example

Short notes

Questions

writeStream.clearLine() Method

Example

Short notes

Questions