The Error Object — JS Technical Interview Questions & Answers

name, message and stack properties.

The Error Object

  • The Error Object (js) is a JS topic. In plain words you use it for { name, marks } in a student record. Don’t start with a slogan — start with that picture.
  • Smallest example: const { name } = student. Type it, run it, and say what you see. If you can do that from memory, you know The Error Object (js).
  • From the example next to this theory: name, message and stack properties.
  • Trap: copying nested objects by accident (shallow copy). Fix that before you talk about advanced JS.
  • Viva: what is The Error Object (js)? Then show const { name } = student. Then name the trap.

Technical Interview Tip: What is The Error Object (js)? Show this: const { name } = student. Trap: copying nested objects by accident (shallow copy).

Code Examples for The Error Object

The Error Object — working example

function parseAge(raw) {
  const n = Number(raw);
  if (Number.isNaN(n)) throw new TypeError("age must be a number");
  if (n < 0) throw new RangeError("age must be >= 0");
  return n;
}
try {
  console.log(parseAge("21"));
  console.log(parseAge("nope"));
} catch (err) {
  console.log(err.name + ": " + err.message);
} finally {
  console.log("done");
}

The Error Object — try/catch handles thrown errors; use Error subtypes for clearer failures; finally always runs.

How to Explain The Error Object to an Interviewer

What is The Error Object (js)?

Used for { name, marks } a student record Not just the heading

Give one small example of The Error Object (js).

const { name } = student name, message and stack properties

What mistake do beginners make with The Error Object (js)?

copying nested objects by accident (shallow copy) Show the fix

Where do you use The Error Object (js)?

a student record { name, marks }