Built-in Error Types — JS Technical Interview Questions & Answers

TypeError, RangeError, ReferenceError, SyntaxError.

Built-in Error Types

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

Technical Interview Tip: What is Built-in Error Types (js)? Show this: the smallest Built-in Error Types js example you can type. Trap: only saying “Built-in Error Types js” with no example.

Code Examples for Built-in Error Types

Built-in Error Types — 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");
}

Built-in Error Types — try/catch handles thrown errors; use Error subtypes for clearer failures; finally always runs.

How to Explain Built-in Error Types to an Interviewer

What is Built-in Error Types (js)?

Used for a short Built-in Error Types js example a script in the browser Not just the heading

Give one small example of Built-in Error Types (js).

the smallest Built-in Error Types js example you can type TypeError, RangeError, ReferenceError, SyntaxError

What mistake do beginners make with Built-in Error Types (js)?

only saying “Built-in Error Types js” with no example Show the fix

Where do you use Built-in Error Types (js)?

a script in the browser a short Built-in Error Types js example