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Node.js · Theory

NestJS

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Theory

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NestJS

NestJS is simple if you keep it on paper. Sara uses it for Sara walking through NestJS in a campus project.

Do NestJS once by hand. one NestJS step Sara can write from memory. Change one input. Say the new result out loud.

Skip NestJS and skipping the failure case for NestJS shows up in a campus project.

Sara ships NestJS in a campus project. That is the use case worth saying.

NestJS trap — skipping the failure case for NestJS. Sara loses marks for that every viva.

NestJS is not a lonely heading. Sara ties it to Sara walking through NestJS.

Viva for NestJS: what it is → one NestJS step Sara can write from memory → the mistake (skipping the failure case for NestJS).

Exam tip

Board: Sara walking through NestJS. Dry-run NestJS. Name the trap: skipping the failure case for NestJS.

Example

// NestJS
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));

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

Short notes

  • DefNestJS — Sara uses it for Sara walking through NestJS in a campus project.
  • RuleNestJS → one NestJS step Sara can write from memory.
  • RememberNestJS + the event loop (a campus project).
  • UseNestJS in a campus project (Sara walking through NestJS).
  • TrapNestJS — skipping the failure case for NestJS.
  • ExNestJS → Sara walking through NestJS.

Questions

1

What is NestJS? Teach it with Sara walking through NestJS.

2

Where does NestJS show up in a campus project?

3

Which mistake makes Sara walking through NestJS fail?

4

Dry-run one NestJS step Sara can write from memory and say the result.

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