Node.js · Theory

MongoDB Query

Theory

49/723

MongoDB Query

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

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

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

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

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

Exam tip

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

Example

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

Short notes

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

Node.js · Theory

MongoDB Query

← All stacks

Theory

49/723

MongoDB Query

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

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

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

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

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

Exam tip

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

Example

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

Short notes

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

MongoDB Query

Example

Short notes

Questions

MongoDB Query

Example

Short notes

Questions