forEach() — Node.js Technical Interview Questions & Answers

forEach()

forEach()

  • forEach() (function) is a Node.js topic. In plain words you use it for a short forEach function example in a script or API on localhost. Don’t start with a slogan — start with that picture.
  • Smallest example: the smallest forEach function example you can type. Type it, run it, and say what you see. If you can do that from memory, you know forEach() (function).
  • From the example next to this theory: forEach(): find user 2, then list names.
  • Trap: only saying “forEach function” with no example. Fix that before you talk about advanced Node.js.
  • Viva: what is forEach() (function)? Then show the smallest forEach function example you can type. Then name the trap.

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

Code Examples for forEach()

forEach() — working example

// forEach()
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));

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

How to Explain forEach() to an Interviewer

What is forEach() (function)?

Used for a short forEach function example a script or API on localhost Not just the heading

Give one small example of forEach() (function).

the smallest forEach function example you can type forEach(): find user 2, then list names

What mistake do beginners make with forEach() (function)?

only saying “forEach function” with no example Show the fix

Where do you use forEach() (function)?

a script or API on localhost a short forEach function example