Node.js · Theory

Creating Custom Node.js Modules

← All stacks

Theory

714/723

Creating Custom Node.js Modules

Zara only reaches for Creating Custom Node.js Modules when install express has to stay correct in a new folder.

Keep Creating Custom Node.js Modules small. Zara should finish install express in a few lines, not a 40-line dump.

Creating Custom Node.js Modules exists so Zara can keep install express correct in a new folder.

Creating Custom Node.js Modules shows up in a new folder. Name install express, not “a real-world scenario”.

Don’t do this with Creating Custom Node.js Modules: deleting package-lock blindly. Interviewers spot it in ten seconds.

After Creating Custom Node.js Modules, Zara should still remember deleting package-lock blindly.

One breath for Creating Custom Node.js Modules, then install express, then deleting package-lock blindly. Sit down.

Exam tip

For Creating Custom Node.js Modules: definition + a new folder + one failure.

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 — Zara uses it for install express in a new folder.
RuleCreating Custom Node.js Modules → npm init + npm i express.
RememberCreating Custom Node.js Modules + npm (a new folder).
UseCreating Custom Node.js Modules in a new folder (install express).
TrapCreating Custom Node.js Modules — deleting package-lock blindly.
ExCreating Custom Node.js Modules → install express.

// 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