Node.js · Theory

shift()

Theory

116/723

shift()

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

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

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

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

Viva — what is shift() (function)? Then show the smallest shift function example you can type. Then name the trap.

Exam tip

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

Example

// shift()
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));

shift(): find user 2, then list names. Say both prints.

Short notes

Defshift() (function) — a short shift function example in a script or API on localhost.
Rulethe smallest shift function example you can type
Traponly saying “shift function” with no example
Usea script or API on localhost

Node.js · Theory

shift()

← All stacks

Theory

116/723

shift()

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

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

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

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

Viva — what is shift() (function)? Then show the smallest shift function example you can type. Then name the trap.

Exam tip

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

Example

// shift()
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));

shift(): find user 2, then list names. Say both prints.

Short notes

Defshift() (function) — a short shift function example in a script or API on localhost.
Rulethe smallest shift function example you can type
Traponly saying “shift function” with no example
Usea script or API on localhost

shift()

Example

Short notes

Questions

shift()

Example

Short notes

Questions