Node.js · Theory

Creating Custom Node.js Modules

Theory

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Creating Custom Node.js Modules

Creating Custom Node.js Modules is a Node.js topic. In plain words you use it for install express in a new folder. Don’t start with a slogan — start with that picture.

Smallest example: npm init + npm i express. Type it, run it, and say what you see. If you can do that from memory, you know Creating Custom Node.js Modules.

From the example next to this theory — Creating Custom Node.

Trap — deleting package-lock blindly. Fix that before you talk about advanced Node.js.

Viva — what is Creating Custom Node.js Modules? Then show npm init + npm i express. Then name the trap.

Exam tip

What is Creating Custom Node.js Modules? Show this: npm init + npm i express. Trap: deleting package-lock blindly.

Example

// Creating Custom Node.js Modules
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));

Creating Custom Node.js Modules: find user 2, then list names. Say both prints.

Short notes

DefCreating Custom Node.js Modules — install express in a new folder.
Rulenpm init + npm i express
Trapdeleting package-lock blindly
Usea new folder

// Creating Custom Node.js Modules 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));

Creating Custom Node.js Modules

Example

Short notes

Questions

Creating Custom Node.js Modules

Example

Short notes

Questions