Node.js · Theory

MongoDB Select

Theory

48/723

MongoDB Select

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

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

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

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

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

Exam tip

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

Example

// MongoDB Select
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));

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

Short notes

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

Node.js · Theory

MongoDB Select

← All stacks

Theory

48/723

MongoDB Select

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

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

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

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

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

Exam tip

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

Example

// MongoDB Select
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));

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

Short notes

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

MongoDB Select

Example

Short notes

Questions

MongoDB Select

Example

Short notes

Questions