The throw Statement — JS Technical Interview Questions & Answers

Raising a custom error condition.

The throw Statement

  • The throw Statement (js) is a JS topic. In plain words you use it for a short The throw Statement js example in a script in the browser. Don’t start with a slogan — start with that picture.
  • Smallest example: the smallest The throw Statement js example you can type. Type it, run it, and say what you see. If you can do that from memory, you know The throw Statement (js).
  • From the example next to this theory: Raising a custom error condition.
  • Trap: only saying “The throw Statement js” with no example. Fix that before you talk about advanced JS.
  • Viva: what is The throw Statement (js)? Then show the smallest The throw Statement js example you can type. Then name the trap.

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

Code Examples for The throw Statement

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

How to Explain The throw Statement to an Interviewer

What is The throw Statement (js)?

Used for a short The throw Statement js example a script in the browser Not just the heading

Give one small example of The throw Statement (js).

the smallest The throw Statement js example you can type Raising a custom error condition

What mistake do beginners make with The throw Statement (js)?

only saying “The throw Statement js” with no example Show the fix

Where do you use The throw Statement (js)?

a script in the browser a short The throw Statement js example