Node.js · Theory

Assertion

Theory

27/723

Assertion

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

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

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

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

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

Exam tip

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

Example

// Assertion
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));

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

Short notes

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

Node.js · Theory

Assertion

← All stacks

Theory

27/723

Assertion

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

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

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

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

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

Exam tip

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

Example

// Assertion
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));

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

Short notes

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

Assertion

Example

Short notes

Questions

Assertion

Example

Short notes

Questions