Node.js · Theory

DNS

Theory

13/723

DNS

DNS is a Node.js topic. In plain words you use it for a short DNS example in a script or API on localhost. Don’t start with a slogan — start with that picture.

Smallest example: the smallest DNS example you can type. Type it, run it, and say what you see. If you can do that from memory, you know DNS.

From the example next to this theory — DNS: find user 2, then list names.

Trap — only saying “DNS” with no example. Fix that before you talk about advanced Node.js.

Viva — what is DNS? Then show the smallest DNS example you can type. Then name the trap.

Exam tip

What is DNS? Show this: the smallest DNS example you can type. Trap: only saying “DNS” with no example.

Example

// DNS
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));

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

Short notes

DefDNS — a short DNS example in a script or API on localhost.
Rulethe smallest DNS example you can type
Traponly saying “DNS” with no example
Usea script or API on localhost

Node.js · Theory

DNS

← All stacks

Theory

13/723

DNS

DNS is a Node.js topic. In plain words you use it for a short DNS example in a script or API on localhost. Don’t start with a slogan — start with that picture.

Smallest example: the smallest DNS example you can type. Type it, run it, and say what you see. If you can do that from memory, you know DNS.

From the example next to this theory — DNS: find user 2, then list names.

Trap — only saying “DNS” with no example. Fix that before you talk about advanced Node.js.

Viva — what is DNS? Then show the smallest DNS example you can type. Then name the trap.

Exam tip

What is DNS? Show this: the smallest DNS example you can type. Trap: only saying “DNS” with no example.

Example

// DNS
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));

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

Short notes

DefDNS — a short DNS example in a script or API on localhost.
Rulethe smallest DNS example you can type
Traponly saying “DNS” with no example
Usea script or API on localhost

DNS

Example

Short notes

Questions

DNS

Example

Short notes

Questions